CN112663393A - Anti-oxidation deacidification protective agent for blue-black ink handwriting - Google Patents
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Abstract
The invention relates to an antioxidant deacidification protective agent for blue-black ink handwriting. It comprises the following components used independently: calcium hydroxide solution with pH value of 7.0-7.5, magnesium phytate solution and calcium oxide solution; the solvents of the calcium hydroxide solution, the magnesium phytate solution and the calcium oxide solution are mixed solution of tert-butyl alcohol-absolute ethyl alcohol and water. The anti-oxidation deacidification protective agent for the blue-black ink handwriting is used for treating the blue-black ink handwriting, so that the blue-black ink handwriting can be reinforced, the acid in paper and the handwriting can be removed, the metal ions in the blue-black ink can be stabilized, the oxidation of the metal ions can be prevented, and the service life of the blue-black ink handwriting literature can be prolonged; the blue-black ink anti-oxidation deacidification protective agent does not cause the phenomena of feathering and diffusion of the handwriting after being used, has no influence on the chromatic aberration of the handwriting of the blue-black ink and the paper after being treated, and is simple to operate; the protective agent does not contain components harmful to human bodies and has no pollution to the environment; the protected blue-black ink writing has water-resistant property, and is convenient for subsequent treatments such as decontamination, restoration and the like.
Description
Technical Field
The invention relates to an antioxidant deacidification protective agent for blue-black ink handwriting, belonging to the field of protection and restoration of blue-black ink handwriting.
Background
At the end of the Gongyuan eleventh century, the European Eberet et al made ink by mixing the extract of Vitex negundo and copperas, and the iron tannate ink obtained patent in 1856. The iron salt ink is used as one of the common writing materials in archives, manuscripts and letters, forms a large number of archives, manuscripts, documents and the like, and is stored in different institutions such as archives, libraries, museums and the like or private hands. Because the pigment component is black precipitated pigment (iron tannate and iron gallate), writing is acidic, and after writing on paper, cellulose of the paper is hydrolyzed by acidity, thereby damaging the paper. The phenomenon of holes formed by serious acid etching also occurs in a large number of blue-black ink writing files stored in a practical keeping organization, which causes great and even unrecoverable loss, and the deacidification work of the blue-black ink writing files is urgent.
In the domestic research on the blue-black ink writing files, the research on the core problems of the blue-black ink writing files, such as acid etching and acid removal thereof, is almost blank. Due to the lack of theoretical research, the deacidification and oxidation resistance technology of the actually stored blue-black ink handwriting file is not substantially promoted. For the repair method of the blue-black ink file, whether the faded writing is recovered or the acid-etched file is mounted, only a few research results exist. A small amount of research results on the use of phytate solution for protecting the writing of the iron-core ink are available abroad, and most of the research results are experimental researches to explore the effect of the phytate on the writing of the iron-core ink and the influence of the phytate on paper. The blue-black ink in China is not completely the same as the iron container ink in China in terms of components and processing technology, and the writing effect is different.
Main components of the blue-black ink: iron tannate, iron gallate, sulfuric acid (H)2SO4) Oxalic acid (COOH)2Formaldehyde (HCHO) solution. These stabilizers are acidic in nature and have a pH of about 1.5 to 4.5, which can potentially damage the acidification of the paper. The blue-black ink handwriting is actually in an acidic medium environment containing reducing substances for a long time, so that the organic pigment iron tannate is reduced into ferrous tannate, and the ferric gallate is reduced into ferrous gallate, thereby causing the fading of the blue-black ink. The blue-black ink as the writing material of the file can cause the acidification of the written local paper, the color fading or color change of ink writing and acid corrosion due to the strong acidity of the blue-black ink, and the serious diseases cause the occurrence of holes and the like at the writing part of the writing. The basis is caused by the self components of the blue-black ink. Because the blue-black ink has strong reducibility, iron ions in black components are easy to oxidize and react with oxidizing substances in air to generate a plurality of complex oxides, so that chromophores are damaged, and the fading of the handwriting is causedOr a change in the color of the handwriting; the sulfuric acid has strong acidity, and is absorbed by paper during and after writing, so that the hydrogen ion concentration in the paper is increased, the pH value of the paper is reduced, and the paper is acidified. Acidity accelerates the hydrolysis of cellulose in the paper, and the greater the acidity, the faster the paper ages. Therefore, documents such as files and manuscripts written by blue-black ink have the phenomena of fading and discoloring of the handwriting, deterioration and embrittlement of paper and the like in the long-term storage process, and serious documents have holes in the handwriting due to corrosion.
To solve the problem of paper acidification, alkaline substances are often used for neutralization. However, no matter which deacidification agent is adopted, the color of the blue-black ink writing can be influenced to a certain extent, because the pigment of the blue-black ink contains black components of iron tannate and iron gallate as well as color assisting agents, namely, the acid ink blue 5B and the acid ink blue, wherein the former presents blue light green when meeting concentrated sulfuric acid, and the former presents purple precipitate when meeting an alkaline substance, such as sodium hydroxide solution; the latter does not deteriorate in the presence of acids, but changes color in the presence of bases. The blackening component in the blue-black ink writing is formed under an acidic condition and is kept stable, wherein sulfuric acid is used as a stabilizer, and once the acidic condition is changed, the stability of the blackening component is reduced to cause the color change of the writing. Therefore, when the acid of paper such as files and manuscripts is removed, the characters of the blue-black ink are changed in nature and color once the characters contact with alkaline substances, and the original appearance of the files is damaged. The acidity is removed by using the common paper deacidification method, such as the direct deacidification of magnesium oxide and calcium hydroxide solution, but the original appearance of the handwriting is damaged. Therefore, the acid can not be removed directly on the files of the blue-black ink writing by the conventional method.
How to prevent the blue-black ink writing from being easily oxidized, the paper strength is reduced due to acidification, the performance stability of the writing is kept during deacidification, and the acidification degree of the paper writing can be reduced at the same time, which is a very concern in the fields of China, America, Singapore, German archives, books, cultural relics and the like.
Wagner, B; bulska, E proposed in 2002 to promote the inactivation of iron ions in blue-black ink by a complexing method so as to prevent oxidation and protect ancient manuscripts, wherein deferoxamine mesylate, potassium magnesium phytate and diethylenetriamine pentaacetic acid solutions with different concentrations are used to slow down the oxidation process of manuscripts; henniges, Ute; the method is similar to Potthast, Antje, proves the positive effect of calcium phytate in deacidification of the iron-bladder ink writing (similar to the blue-black ink writing in China) on the molecular level, and has better effect on treatment of the iron-bladder ink writing containing copper; malesic, Jasna; sala, Martin and the like find that the paper with the iron gallbladder ink writing is stable and is not oxidized or hydrolyzed by using tetrabutylammonium bromide as an antioxidant and using an alkaline buffer solution to dip the paper; but the handwriting can be discolored, and the original appearance of the file can be changed; huhsmann, Enke and Haehner, Ulrike have established a set of phytate treatment iron-container ink writing procedures specially for protecting the autograph of Savigny garden: observing the characteristics of ink handwriting, testing iron ions and testing the wettability of an object, if the treatment steps are carried out, increasing the humidity, wetting, cleaning, combining free iron ions by using a calcium phytate solution, carrying out alkaline buffering by using a calcium bicarbonate solution, enhancing the mechanical stability by using a gelatin solution, placing the ink in a dry place, and airing.
The blue-black ink in China and the iron-bladder ink commonly used abroad contain iron, the main components are the same, but the specific component proportion and the process are different, and the difference of the action mechanism and the effect of the phytate used for deacidifying the blue-black ink and the deacidification of the iron-bladder ink used abroad needs to be compared. On the basis of summarizing foreign methods, the invention combines the production and manufacturing characteristics of domestic iron salt ink and the characteristics of paper written by Chinese iron salt ink to design an anti-oxidation and deacidification protective agent for the iron salt ink.
The LC blue ink writing developing reinforcing agent developed by professor Liyuhu at Shanxi university of teacher in China obtains the third-class prize of the national invention in 1991. The technology utilizes the water-based fluorine material as the display reinforcing agent to display the faded blue-black ink file handwriting. However, the technology aims at the phenomenon that the fading blue-black ink handwriting appears, the oxidation resistance of iron ions of the blue-black ink is not prevented, and the problem of paper acid corrosion caused by strong acidity in the blue-black ink is not solved.
Disclosure of Invention
The invention aims to provide an antioxidant deacidification protective agent for blue-black ink handwriting, which can protect the blue-black ink handwriting, improve the antioxidant capacity, obviously improve the acidification condition, hardly influence paper and the handwriting, and has better and stable integral action effect.
The invention provides an anti-oxidation deacidification protective agent for blue-black ink handwriting, which comprises the following components used independently:
calcium hydroxide solution (as cleaning agent) with pH value of 7.0-7.5, magnesium phytate solution (as chelating agent) with pH value of 5.8, and calcium oxide solution (as deacidification protective agent);
the solvents of the calcium hydroxide solution, the magnesium phytate solution and the calcium oxide solution are tert-butyl alcohol, and a mixed solution of absolute ethyl alcohol and water (tert-butyl alcohol-absolute ethyl alcohol aqueous solution for short).
In the protective agent, the calcium hydroxide solution is prepared by adding calcium hydroxide solid powder into the solvent to enable the pH value of the solution to be 7.0-7.5.
In the protective agent, the magnesium phytate solution is prepared by dissolving 50% phytic acid solution and basic magnesium carbonate in the solvent, and then adding diluted ammonia water to adjust the pH value of the solution to 5.8;
the volume ratio of the phytic acid 50% solution to the basic magnesium carbonate to the solvent is 0.57 g: 0.7 g: 500 ml; the brand of the phytic acid 50% solution is RHAWN, CAS number: 83-86-3; the basic magnesium carbonate is powdery solid.
In the protective agent, the calcium oxide solution is prepared by adding calcium oxide into the solvent, standing and taking supernate; the volume ratio of the mass of the calcium oxide to the solvent is 0.5 g: 300 ml.
In the above protective agent, the volume ratio of the tert-butyl alcohol, the absolute ethyl alcohol and the water may be specifically 32.5: 617.5: 350. the water is specifically deionized water.
The protective agent is applied to the protection and restoration of paper files and manuscripts written by blue and black ink.
The invention also provides a method for carrying out anti-oxidation deacidification treatment on the blue-black ink handwriting by adopting the protective agent, which comprises the following steps 1) or 2):
1) sequentially soaking paper files and manuscripts written by blue-black ink in the calcium hydroxide solution, the magnesium phytate solution and the calcium oxide solution for treatment so as to enable the blue-black ink to obtain anti-oxidation deacidification;
2) sequentially dipping the calcium hydroxide solution, the magnesium phytate solution and the calcium oxide solution in the protective agent of any one of claims 1 to 3, painting on the blue-black ink writing of paper files and manuscript paper patterns, standing at room temperature, and naturally drying.
In the method 1), the time for soaking in the calcium hydroxide solution may be 20 minutes;
the soaking time in the magnesium phytate solution can be 20 minutes;
the time for soaking the solution in the calcium oxide may be 20 minutes.
The invention has the following advantages:
the anti-oxidation deacidification protective agent for the blue-black ink handwriting can be used for treating the blue-black ink handwriting, can reinforce the blue-black ink handwriting, removes acid in paper and the handwriting, stabilizes metal ions in the blue-black ink, prevents the metal ions from being oxidized, and prolongs the service life of documents formed by the blue-black ink. The anti-oxidation deacidification protective agent for the blue-black ink can not cause the phenomena of feathering and diffusion of the writing after being used, has no influence on the color difference of the writing of the blue-black ink and the paper after being processed, and is simple to operate. The protective agent does not contain components harmful to human bodies and has no pollution to the environment. The protected blue-black ink writing has water-resistant property, and is convenient for subsequent treatments such as decontamination, restoration and the like.
Drawings
Fig. 1 is a schematic diagram of a color difference test point.
Fig. 2 is a graph showing the comparison of the handwriting before and after the experimental treatment, and it can be seen that the color change of the handwriting before and after the experiment is very slight.
FIG. 3 is a graph comparing handwriting before and after a water resistance test.
FIG. 4 is a graph showing a comparison of handwriting before and after an acid resistance test.
FIG. 5 is a graph comparing handwriting before and after alkali resistance test.
FIG. 6 is a graph showing a comparison of handwriting before and after UV irradiation.
FIG. 7 is a graph comparing handwriting before and after dry heat aging.
FIG. 8 shows the blurring of writing paper before and after aging.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The phytic acid 50% solution described in the following examples is under the brand name RHAWN, spec: 100 g/bottle, CAS number: 83-86-3.
Examples 1,
An antioxidant deacidification protective agent for blue-black ink handwriting, which consists of the following components used independently:
a calcium hydroxide solution with a pH value of 7.0-7.5 (as a cleaning agent, the pH value can be 7.1 specifically), a magnesium phytate solution with a pH value of 5.8 (as a chelating agent), and a calcium oxide solution (as a deacidification protective agent);
the solvents of the calcium hydroxide solution, the magnesium phytate solution and the calcium oxide solution are mixed solution of tert-butyl alcohol, absolute ethyl alcohol and deionized water (tert-butyl alcohol-absolute ethyl alcohol aqueous solution for short), wherein the volume ratio of tert-butyl alcohol to absolute ethyl alcohol to deionized water is as follows: 32.5 ml: 617.5 ml: 350 ml.
Wherein the calcium hydroxide solution is prepared by adding calcium hydroxide solid powder into the solvent to ensure that the pH value of the solution is 7.0-7.5;
adding 0.57g of phytic acid 50% solution and 0.7g of basic magnesium carbonate powdery solid into 500ml of the solvent, and then adding diluted ammonia water to adjust the pH value of the solution to 5.8 to obtain the magnesium phytate solution;
adding 0.5g calcium oxide into 300ml solvent, standing, and collecting supernatant.
Examples 2,
Paper files and manuscripts written by blue-black ink are sequentially soaked in calcium hydroxide solution with the pH value of 7.1, magnesium phytate solution with the pH value of 5.8 and calcium oxide solution in the embodiment 1 of the invention for treatment. Through the treatment, the blue-black ink writing is protected, the oxidation resistance is improved, the acidification condition is obviously improved, the paper and the writing are hardly influenced, and the whole action effect is good and stable.
Examples 3,
The cotton is rubbed into small balls, the cotton is clamped by tweezers to dip the anti-oxidation deacidification protective agent for the blue-black ink writing in the embodiment 1 of the invention, the small cotton balls are evenly coated on the ink writing part of the paper sample after being completely wetted, and the cotton balls are placed at room temperature and naturally dried. Through the treatment, the blue-black ink writing is protected, the oxidation resistance is improved, the acidification condition is obviously improved, the paper and the writing are hardly influenced, and the whole action effect is good and stable.
Examples 4,
By sequentially adopting the calcium hydroxide solution for cleaning, the magnesium phytate solution (pH 5.8) for antioxidation and the calcium oxide solution for deacidification in the anti-oxidation deacidification protective agent for the black and blue ink handwriting in the embodiment 1 of the invention, the anti-oxidation capability of the processed black and blue ink handwriting is improved, the acidification condition can be improved, the change of the handwriting color difference is small, the paper is hardly influenced, and the whole effect is good and stable. The specific data of the experimental results are shown in table 1:
TABLE 1 Experimental deacidification and Oxidation resistance
The test of handwriting comparison before and after water immersion, acid resistance, alkali resistance, ultraviolet illumination and dry heat aging is respectively carried out, and the five tests are carried out according to DA/T16-95 archival handwriting material durability test method.
The durability test was performed on the blue-black ink writing paper sample treated with the protective agent and the untreated blue-black ink writing paper sample, respectively. Before the test, a colorimeter is used for measuring and calculating colorimetric values L of three positions (shown in figure 1) of the blue-black ink writing pattern A, B, C* 0，a* 0，b* 0(ii) a Storing in dark for 24 hr after endurance test, measuring with color difference meter and calculating to obtain the blue-black ink writing paper sample AB, C chroma value L* 1，a* 1，b* 1The color difference value delta E before and after the aging test is calculated by the following formula.
And (3) water immersion test: and (3) pouring 60ml of deionized water into a dry and clean culture dish at room temperature, respectively putting each small group of paper patterns into the culture dish until the small group of paper patterns are completely immersed, taking out the paper patterns after soaking for 10 minutes, and avoiding direct irradiation of sunlight and naturally airing the paper patterns.
Acid resistance test: adding 12mol/L concentrated hydrochloric acid into deionized water to dilute into 0.01N HCl solution, adding 60ml of HCl solution into a dry and clean culture dish at room temperature, completely soaking each group of paper samples into the solution respectively, taking out after 10 minutes, washing with distilled water for three times, and avoiding direct irradiation of sunlight and naturally drying.
Alkali resistance test: preparing 0.01N NaOH solution by using sodium hydroxide solid and deionized water, pouring 60ml of the NaOH solution into a dry and clean culture dish at room temperature, respectively soaking each group of paper samples in the NaOH solution, completely soaking the paper samples, taking out the paper samples after 10 minutes, washing the paper samples with distilled water for three times, and avoiding direct sunlight and naturally drying the paper samples.
Ultraviolet irradiation: and (3) uniformly placing each paper sample in an ultraviolet illumination box at room temperature, illuminating for 24 hours by using an ultraviolet lamp tube with the power of 30W and the wavelength of 253.7nm, taking out, keeping in the dark for 24 hours, and then testing.
Dry heat aging: and uniformly spreading the prepared paper pattern in a dry heat ageing oven, setting the temperature of the dry heat ageing oven to be 105 ℃, starting timing when the temperature index in the oven is stabilized at (105 +/-2) DEG C, and aging for 72 hours. And after 72 hours, taking out the box after the temperature in the box is reduced to room temperature, and storing the box in a dark place for 24 hours to be measured.
The results are shown in table 2 and fig. 3-7, which are graphs comparing the handwriting before and after water immersion, acid resistance, alkali resistance, ultraviolet irradiation and dry heat aging, and it can be seen that the experiment has no obvious influence on the durability of the handwriting, wherein the alkali resistance is obviously enhanced.
TABLE 2 Experimental effects on durability of blue and black ink writings
Testing the paper performance:
pH value: the test uses a pH meter to carry out nondestructive acid measurement on the paper sample to be measured, and the pH value of the surface of the paper sample is measured. 3 measurement points were selected for each sample and the pH was recorded.
Quantifying: according to GB/T451.2-2002 paper and board basis weight determination, 10 sheets of paper and board are prepared per group with an area of 100cm2The pattern of (2) is divided into two stacks of 5 sheets each. The mass of the sample is measured by using an electronic balance, and the average value is obtained, and finally the total mass of the sample per square meter, namely the mass of the sample per unit area is calculated.
Thickness: according to GB/T451.3-2002 paper and paperboard thickness measurement, a stack of paper samples with the area of 100cm2 is prepared for each group, 10 paper samples are stacked, 3 points to be measured are selected, the thickness of three points is measured by a thickness measuring instrument, data is recorded and an average value is obtained, and finally the thickness of one paper sheet of the paper sample is calculated.
Fourthly, whiteness: according to GB/T22880-2008 determination of CIE whiteness of paper and cardboard, a stack of sheets having an area of 100cm is prepared for each group2And (3) selecting 3 points to be measured for each 10 stacked paper samples, measuring the whiteness of the three points by using a whiteness measuring instrument, recording whiteness data and calculating an average value to obtain the whiteness of the paper sample.
Folding strength: according to GB/T457-2008 determination of folding resistance of paper and paperboard, the tension of each group of paper patterns in the test is set to be the same and is 0.5kg, and the folding resistance of different groups of paper patterns can be analyzed through comparison of folding times. In each group, 5 paper patterns of 15mm multiplied by 100mm are prepared respectively in the transverse direction and the longitudinal direction, and in order to prevent invalid data from appearing in the test, a spare paper pattern is reserved in a proper amount. And (3) carrying out folding endurance test by using a folding endurance instrument, recording 5 effective data and calculating an average value, wherein the folding endurance times of the paper sample can be used for representing the folding endurance of the paper sample in the test.
Sixthly, tensile strength: according to GB/T12914-2008 paper and paperboard tensile strength measurement, 5 paper patterns of 15mm multiplied by 270mm are prepared in each group, and in order to prevent invalid data from appearing in the test, a spare paper pattern is reserved in a proper amount. And (3) carrying out a tensile test on the paper sample by using a tensile strength meter, recording 5 effective data and calculating an average value, namely the tensile strength of the paper sample.
Dry heat aging: according to the dry heat accelerated aging of GB/T464-2008 paper and paperboard, paper samples are evenly paved in a dry heat aging box, the aging temperature is set to be 105 ℃, and timing is started when the temperature in the box is stable, and continuous aging is carried out for 72 hours. And after the dry heat aging is finished, closing the instrument, and taking out the paper pattern to be tested after the temperature in the box is reduced to the room temperature.
Sufficient writing paper and coated paper are treated by using the deacidification protective agent in the embodiment 1 of the invention. After air-drying and flattening, cutting the paper pattern into a proper shape to measure and extract paper performance index data, including 6 performance indexes of pH value, quantification, thickness, whiteness, folding strength and tensile strength, and comparing the performance indexes with the performance indexes of the same batch of writing paper and coated paper which are not subjected to any treatment; and (3) simultaneously carrying out dry heat aging tests on the rest part of paper samples, the same batch of writing paper and coated paper, and comparing the properties of the aged paper samples with the properties of the aged paper to obtain data results in the table 3.
TABLE 3 Effect of the experiment on paper Properties
As shown in Table 3 and FIG. 8, the experimental group (treated with the anti-oxidant deacidification protectant for the black and blue ink handwriting of example 1 of the present invention) slowed down the feathering of the handwriting.
The antioxidant deacidification protective agent for blue-black ink has obvious effects of deacidification and antioxidation of blue-black ink writing by phytate solution through the tests of high temperature resistance, high humidity resistance, acid resistance, alkali resistance and the like and the accelerated aging tests of ultraviolet aging, dry heat aging, damp heat aging and the like. The anti-oxidation deacidification protective agent for the blue-black ink does not cause the phenomena of feathering and diffusion of the writing after being used, does not influence the color difference of the writing of the blue-black ink and paper after being processed, and has obvious effect on the durability of the file.
Claims (8)
1. The anti-oxidation deacidification protective agent for the blue-black ink handwriting comprises the following components which are used independently:
calcium hydroxide solution with pH value of 7.0-7.5, magnesium phytate solution and calcium oxide solution;
the solvents of the calcium hydroxide solution, the magnesium phytate solution and the calcium oxide solution are mixed solution of tert-butyl alcohol-absolute ethyl alcohol and water.
2. The protective agent according to claim 1, characterized in that: the calcium hydroxide solution is prepared by adding calcium hydroxide solid powder into the solvent to enable the pH value of the solution to be 7.0-7.5.
3. The protective agent according to claim 1 or 2, characterized in that: the magnesium phytate solution is prepared by dissolving 50% phytic acid solution and basic magnesium carbonate in the solvent, and then adding dilute ammonia water to make the pH value of the solution be 5.8;
the volume ratio of the phytic acid 50% solution to the basic magnesium carbonate to the solvent is 0.57 g: 0.7 g: 500 ml.
4. The protective agent according to any one of claims 1 to 3, characterized in that: the calcium oxide solution is prepared by adding calcium oxide into the solvent, standing and taking supernatant fluid; the volume ratio of the mass of the calcium oxide to the solvent is 0.5 g: 300 ml.
5. The protective agent according to any one of claims 1 to 4, characterized in that: the volume ratio of the tertiary butanol to the absolute ethyl alcohol to the water is 32.5: 617.5: 350.
6. use of the protectant of any of claims 1-5 in paper archives written in blue-black ink, manuscript protection repair.
7. A method for carrying out anti-oxidation deacidification treatment on blue black ink handwriting by using the protective agent of any one of claims 1 to 5, comprising the following steps 1) or 2):
1) sequentially soaking paper files and manuscripts written by blue-black ink in the calcium hydroxide solution, the magnesium phytate solution and the calcium oxide solution for treatment so as to enable the blue-black ink to obtain anti-oxidation deacidification;
2) sequentially dipping the calcium hydroxide solution, the magnesium phytate solution and the calcium oxide solution in the protective agent of any one of claims 1 to 3, painting on the blue and black ink writing on paper files and manuscript paper samples, standing at room temperature, and naturally drying.
8. The method of claim 7, wherein: in the method 1), the time for soaking in the calcium hydroxide solution is 20 minutes;
the soaking time in the magnesium phytate solution is 20 minutes;
the time for soaking the solution in the calcium oxide was 20 minutes.
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| CN106368065A (en) * | 2016-11-21 | 2017-02-01 | 陕西师范大学 | Method for augmentation of soluble handwriting on paper historical relics |
| CN110172862A (en) * | 2019-06-15 | 2019-08-27 | 湖北泰德安信信息技术有限公司 | Deacidification agent and preparation method thereof based on sodium phytate modified Nano magnesia |
| WO2020127994A1 (en) * | 2018-12-21 | 2020-06-25 | Prescon Ag | Use of electrospinning methods for conservation and restoration of cultural assets and device therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106368065A (en) * | 2016-11-21 | 2017-02-01 | 陕西师范大学 | Method for augmentation of soluble handwriting on paper historical relics |
| WO2020127994A1 (en) * | 2018-12-21 | 2020-06-25 | Prescon Ag | Use of electrospinning methods for conservation and restoration of cultural assets and device therefor |
| CN110172862A (en) * | 2019-06-15 | 2019-08-27 | 湖北泰德安信信息技术有限公司 | Deacidification agent and preparation method thereof based on sodium phytate modified Nano magnesia |
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