JPH0959547A - Colored ink and writing system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To readily and cleanly carry out erasing of written marks such as drawn picture, letter, etc., and correcting operation by instantly decoloring the written marks by adhesion of water. SOLUTION: Writing is carried out by using a colorless mixed solution obtained by blending a coloring auxiliary containing 3-15 pts.wt. of one or more electron-accepting developing compound selected from the group A consisting of adipic acid, ascorbic acid, benzoic acid, zinc chloride, calcium chloride, magnesium chloride, thiamine hydrochloride, citric acid, glycolic acid, succinic acid, salicylic acid, tartaric acid, tannic acid, nicotinic acid, lactic acid, glacial acetic acid, fumaric acid, propyl gallate, malic acid and phosphoric acid with a colorant containing an electron donative coloring compound coloring from a substantially invisible colorlessness into a visible color by the coloring auxiliary. Writing marks are decolored from a color to colorlessness by coating the written marks with an erasing solution composed of water or water and a surfactant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored ink capable of erasing a written mark such as a picture or a written character with water, and erasing and correcting the written mark easily and cleanly. It relates to a writing system using it.

[0002]

2. Description of the Related Art Conventionally, pencils, fountain pens, ballpoint pens, water-based / oil-based felt pens, etc. have been widely known as writing instruments. For example, a pencil can be used for erasing or correcting a written mark such as a picture / character written on them. In the case of No. 3, it was necessary to use an eraser or the like utilizing the adsorption effect of rubber, and in the case of a fountain pen, it was necessary to use an ink eraser or the like utilizing the bleaching action. In the case of a felt pen, etc., when writing on a non-permeable surface such as glass or plastic, it can be erased by wiping with a paper or cloth containing a solvent that dissolves ink, When writing on a penetrable surface such as cloth, the ink penetrates into the surface, making it difficult to erase even with the use of a solvent.Therefore, in such a case, the written mark is hidden from above, for example, white correction liquid, white correction Use of tape is required.

[0003]

As described above, in the conventional writing, there is an inconvenience that a dedicated member containing a solvent or the like has to be used for erasing and correcting a written trace, and in recent years, erasing has been performed. It is strongly desired to develop a writing system that can more easily make corrections.

The so-called white plate marker used for a white plate uses ink in which a powder pigment is suspended and agitated in alcohol, so that the handwriting trace is only the powder pigment attached after drying. Can be easily wiped off with a cloth. However, such erasing by wiping is limited to a white plate or the like having a non-permeable surface, and the powder pigment scatters and stains the surroundings during wiping. Moreover, due to the characteristics of the ink,
There is also a problem that it is not possible to follow fast writing such as inferior efficiency of wicking of pigment, and uneven writing such as fading occurs.

Therefore, in view of such a situation, the inventor of the present invention has conducted extensive research on various dyes, pigments and the like. As a result, among the electron-donating color compounds known as dyes, some compounds react with a specific acidic color-developing compound such as adipic acid and benzoic acid to develop from colorless to colored, while water. It has been discovered that the loss of the effect of the color-developing compound due to the adherence of the compound returns to the colorless state from the color-developed state, and this change of the colorless / color-developed state can be repeated. Then, by using an anhydrous colored ink in which the specific color-forming compound and the color-developing compound are mixed, the emergence of a novel writing system capable of satisfying the conventional requirements can be found.

Therefore, the first, second, fifth and sixth aspects of the present invention are described.
The invention described in (1) is intended to provide a colored ink capable of erasing and correcting writing traces conveniently and cleanly, and a writing system using the same.

In addition to the objects of the inventions described in claims 1, 2, 5 and 6, the inventions described in claims 3 and 7 suppress the color fading of the colored ink after writing to improve the sharpness of the ink. The purpose is to provide a colored ink to keep and a writing system using it.

Further, in addition to the objects of the inventions described in claims 1, 2, 5 and 6, the inventions described in claims 4 and 8 are characterized in that the handwriting of colored ink is erased by applying a decolorizing liquid. At the same time, the purpose is to provide a colored ink that makes it easy to remove the ink from the writing surface and a writing system using the colored ink.

[0009]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is adipic acid, ascorbic acid, benzoic acid, zinc chloride, calcium chloride, magnesium chloride, hydrochloric acid. Thiamine, citric acid,
One or more electron-accepting color developing compounds selected from the group A consisting of glycolic acid, succinic acid, salicylic acid, tartaric acid, tannic acid, nicotinic acid, lactic acid, glacial acetic acid, fumaric acid, propyl gallate, malic acid, phosphoric acid Of 3 to 15 parts by weight, and a color-forming agent containing an electron-donating color-forming compound which is substantially invisible from colorless to visible and colored by the color-forming aid, and is an anhydrous mixed solution. And, the handwriting written with this mixed solution is characterized by erasing from colored to colorless by applying a decolorizing solution consisting of water or water and a surfactant.

The invention according to claim 2 is characterized in that, in addition to the constitution of the invention according to claim 1, the constitution of the kind and the content of the electron-donating color-forming compound which can be suitably used as a color former is added. I will.

The invention according to claim 3 is characterized in that, in addition to the composition of the invention according to claim 1, the composition of the kind and the content of a water-soluble resin which can be suitably used as a color-holding agent is added.

The invention described in claim 4 is characterized in that the composition of the invention described in claim 1 is added with the composition of the kind and the content of the surfactant which can be preferably used as the decoloring liquid.

The invention according to claim 5 of the present invention is
Adipic acid, ascorbic acid, benzoic acid, zinc chloride, calcium chloride, magnesium chloride, thiamine hydrochloride, citric acid, glycolic acid, succinic acid, salicylic acid, tartaric acid, tannic acid, nicotinic acid, lactic acid, glacial acetic acid, fumaric acid, gallic acid A color-forming aid containing 3 to 15 parts by weight of one or more electron-accepting color-developing compounds selected from the group A consisting of propyl, malic acid, and phosphoric acid; A colored ink composed of an anhydrous mixed liquid in which a color former containing an electron-donating color-forming compound that develops a visible color is mixed, and the colored ink composed of water or a decolorizing liquid composed of water and a surfactant. The feature is that the handwriting written with ink is erased from colored to colorless by applying the decoloring liquid.

The invention according to claim 6 is characterized in that, in addition to the constitution of the invention according to claim 5, the constitution of the kind and content of the electron-donating color-forming compound which can be preferably used as a color former is added. I will.

The invention according to claim 7 is characterized in that, in addition to the composition of the invention according to claim 5, the composition of the kind and the content of the water-soluble resin which can be suitably used as a color-holding agent is added.

The invention according to claim 8 is characterized in that, in addition to the composition of the invention according to claim 5, the composition of the kind and the content of the surfactant which can be suitably used as the decoloring liquid is added.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
This will be described together with the illustrated example. In the figure, the writing instrument 1 has a shape of a felt pen in which a liquid colored ink 3 is contained in a container body 2. In this example, the writing instrument 1 is used as, for example, a white plate marker.

The container body 2 has a pen-shaped cylindrical body 6 whose rear end is sealed by a bottom lid 5, a pen tip metal fitting 7 fitted to the front end thereof, and a cap which covers the pen tip metal fitting 7. Piece 9
And

The nib 7 is composed of a nib core 10 for taking out the colored ink 3 and a nib holding piece 11 for holding the nib.
A partition wall 11A that closes the opening at the front end, a flange 11B that extends rearward from its periphery and is fitted to the body portion 6, and a cone-shaped core material 10 that extends forward from the partition wall 11A.
Is integrally formed with a holding portion 11C that holds the tip by projecting its tip. The core material 10 is, for example, a felt material in which filaments are bundled, and its rear end penetrates the partition wall 11A and communicates with the inside of the container body 2, sucks the colored ink 3 by a capillary phenomenon or the like, and at the tip of the pen tip portion. 10A
The colored ink 3 can be taken out from and written on.

The colored ink 3 further comprises a color-forming aid composed of one or more electron-accepting color developing compounds selected from Group A and one or more electron-donating color-forming compounds selected from Group B. In this example, the agent and the agent are mixed in an alcoholic solvent such as ethanol or isopyropeel alcohol, which is a low-viscosity anhydrous mixed liquid, wherein the electron-accepting developer compound is 100 parts by weight of the colored ink. On the other hand, 3 to 15 parts by weight are contained, and 5 to 20 parts by weight of the electron donative coloration compound is contained.

As the electron-accepting color developing compound of Group A, adipic acid, ascorbic acid, benzoic acid,
Zinc chloride, calcium chloride, magnesium chloride, thiamine hydrochloride, citric acid, glycolic acid, succinic acid, salicylic acid, tartaric acid, tannic acid, nicotinic acid, lactic acid, glacial acetic acid,
There are fumaric acid, propyl gallate, malic acid and phosphoric acid. These are extremely safe for the human body and the like, and guarantee the use of ink in cosmetics, toys and the like.

As the electron-donating color compound of Group B, rhodamine B lactam --- (1) 6-diethylamino-benzo [a] fluorane --- (2) 3-diethylamino-benzo [a] fluorane- --- (3) 3-Diethylamino-7,8-benzofluorane-(4) 3-Diethylamino-7-chlorofluorane-(5) 3,3-bis (1-n-butyl-2) -Methyl-indoyl-3) phthalate --- (6) 3,3-bis (1-ethyl-2-methyl-indoyl-3) -phthalate --- (7) 3,6-bis (diethylamino) fluorane- γ- (4-Nitro) -anilinolactam --- (8) 3-diethylamino-6-methyl-7-chlorofluorane --- (9) 2-bromo-3-methyl-6-dibutylaminofluorane- --- (10) 1,3-Dimethyl-6-diethylaminofluorane --- ( 11) 1,3,3-Trimethyl-ndolino-7'-chloro-β-naphthospiropyran --- (12) 3-cyclohexylamino-6-chlorofluorane --- (13) 2- (phenyliminoethanedili) Den) -3,3-trimethyl-indoline --- (14) N-acetyl auramine --- (15) N-phenyl auramine --- (16) 2- {2- [4- (dodecyloxy) -3-Methoxyphenyl] -ethenyl} quinoline --- (17) 3,6-dimethyloxyfluorane --- (18) Malachite green lactone --- (19) 3-diethylamino-7-dibenzoylaminofluorane- --- (20) 3-Diethylamino-7-chloroanilinofluorane --- (21) 3,6,5'-tri (dimethylamino) fluorene-9-spiro-1 '-(3'-isobenzofuran) --- (22) 3,3-bis (4-diethylamino-2-ethoxyphene ) -4-Azaphthalide --- (23) Crystal Violet Lactone --- (24) Benzoyl Leuco Methylene Blue --- (25) Ethyl Leucomethylene Blue --- (26) Methoxybenzoyl Leuco Methylene Blue --- (27) Di -β-naphthospiropyran --- (28) 3- (4-dimethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methylindoyl-3) -4-azaphthalide --- (29) 3 -(4-Diethylaminophenyl) -3- (1-ethyl-2-methylindoyl-3) phthalide --- (30) 3,7-bis (dimethylamino) -10-benzoylphenocyanazine --- ( 31) Tri (4-dimethylaminophenyl) methane --- (32) 3-cyclohexylmethylamino-6-methyl-7-anilinofluorane --- (33) 3-diethylamino-6-methyl-7-ani Rinofluoran −−− (3 4) 3-Dibutylamino-6-methyl-7-anilinofluorane --- (35) 3-diethylamino-6-methyl-7-kyridenofluorane --- (36) 2- (2-chloroanilino ) -6-Diethylaminofluorane --- (37) 2- (2-chloroanilino) -6-dibutylaminofluorane --- (38) 2-anilino-3-methyl-6-diethylaminofluorane --- ( 39), and the chemical structural formulas of the electron-donating color-forming compounds of Group B are shown in FIGS. 2 to 40, respectively.

The colored ink 3 containing the electron-donating color-developing compound of group A and the electron-accepting color-developing compound of group B has a color unique to each color-forming compound due to the molecular contact between the color-forming compound and the color-developing compound. Develops. In addition, the above No. (1) ~
Of the coloring compounds of No. (39), No. (1) to No. (8) are red,
o. (9) to No. (10) are vermilion, No. (11) to No. (13) are orange, N
o. (14) to No. (18) are yellow, No. (19) to No. (22) are green, No. (23) are sky blue, No. (24) to No. (32) are blue, No.
(33) to No. (39) are colored black respectively.

When a decoloring liquid composed of water is adhered to the colored ink 3, it causes the water to function as if it loses the color-developing compound, thereby instantaneously changing the color development to colorless and water. The colorless (decolored) state is maintained even after drying. Therefore, the colored ink 3 is further formed on the decolorization mark.
Can be written using. In addition, the color erasing action is achieved by the colored ink 3
Since it is performed by a function such as loss of the color developing compound inside, it is also possible to reproduce the handwriting before erasing with color by newly applying an anhydrous color developing liquid containing the color developing compound after drying. Becomes

Further, the colored ink 3 contains polyvinyl alcohol, polyethylene glycol, alginic acid, alginate, cellulose, cellulose derivative, carboxyvinyl polymer, polyethylene oxide for the purpose of suppressing discoloration of handwriting and maintaining the sharpness of the ink. , Sodium polyacrylate, gum tragacanth, gum arabic, guar gum, gelatin, glue, pectin, locust bean gum, galactose mannan, agar, starch.
It is preferable to contain -15 parts by weight.

However, when such a color-holding agent is added to the colored ink 3, since the color-holding agent covers the color-forming agent and the color-forming auxiliary agent, it is difficult to erase the color only by the adhesion of water, and thus the color-erasing is performed. The liquid used is a mixture of water and a surfactant. Examples of the surfactant include sodium alkyl ether sulfate, sodium α-olefinsulfonate, fatty acid alkanolamide, alkylamine oxide, alkylglycoside, polyoxyethylene alkyl ether, sodium alkylsulfosuccinate, polyoxyethylene alkylallyl ether, and polyoxyethylene alkyl allyl ether. One or more kinds selected from the group D consisting of oxyethylene-polyoxypropylene copolymer can be used, and the surfactant may be contained in 2 to 13 parts by weight with respect to 100 parts by weight of the decoloring liquid. preferable. The colored ink containing a color-holding agent can be expected to be used in the field of cosmetics, etc., by utilizing the property that it is difficult to erase the color by adhering only the water, for example, the property that it does not disappear even with sweat.

That is, in addition to being used as a pigment for conventional cosmetics, for example, a paint to be painted on the body such as face, hair, nails, etc., to be dressed up at the time of parties, watching sports, etc. to add entertainment. It can also be used as a class. The paint erases the color before it is washed off with a mixture of water and a surfactant, so that you can easily and quickly return from the disguise even when you are out and outdoors. The remaining discolored paint can be washed off again after returning home.

The decoloring liquid containing the above-mentioned surfactant can exert a decoloring effect on both the colored ink to which the color-holding agent has been added and the colored ink to which the color-holding agent has not been added. Moreover, paper, cloth,
By wiping with a sponge, rubber or the like, the decolored ink itself can be easily removed from the writing surface.
Therefore, for example, by simply erasing the color, there occurs a problem that the color developing agent of the handwriting that has been erased and the color developing agent of the color ink newly written on the mixture are mixed, and the intended color cannot be obtained. However, this problem can be solved by removing the ink itself. In particular, when it is adopted in a white board where writing and erasing are repeatedly performed, it is preferable to use an erasing liquid containing such a surfactant. Further, the decoloring liquid after the ink is removed is clean without any discoloration or the like because the ink itself is decolored, and the repeated erasing of the ink can be carried out for a long period of time. It is possible to remove the ink itself from the colored ink containing no color-holding agent, even by using the decoloring liquid containing only water containing no surfactant.

In this way, the ink agent 3 by the writing instrument 1 is used.
Since the writing marks can be erased by the adhesion of the decolorizing liquid, the writing marks can be erased and corrected very easily, and at the same time, it is possible to easily clean the marks on clothes, walls, etc. The handling is convenient.

In addition, since powder or the like is not generated or scattered during decoloring, the surrounding environment can be kept clean, and since these are completely dissolved in the solvent to form a liquid, suction by the core material 10 is smooth. You can write evenly and smoothly. Further, since the colored ink agent 3 forms a liquid having a low viscosity, it can be suitably used as an ink for a writing pen, a fountain pen, a ballpoint pen, etc. in addition to a felt pen, and can also be used as a printing ink for a publication or the like. A suitable thickener may be added depending on the printing speed.

The colored ink 3 can be erased even when written on the permeable surface, and therefore, for example, paper,
It can be widely applied to various materials such as cloth, wood, and plastic.

[0032]

Example 1 Colored inks were produced as a trial with a combination of the color-developing compound and the color-developing compound shown in Table 1, and the coloring state of the ink at that time and the decoloring state when water was adhered were measured. The ink is 80 parts by weight of solvent (ethyl alcohol), 1 nonionic surfactant (polyethylene glycol ether).
0 parts by weight, 5 parts by weight of color-developing compound (Table 1) and 5 parts by weight of color-developing compound (Table 1) were stirred and heated for 3 minutes.

[0033]

[Table 1]

Further, using calcium chloride as a color-developing compound, ethyl alcohol as a solvent, polyethylene glycol ether as a nonionic surfactant, and a cellulose derivative as a color-keeping agent, colored inks were prepared using the color-forming compounds shown in Tables 2 to 4. Created.

[0035]

[Table 2]

[0036]

[Table 3]

[0037]

[Table 4]

The colored ink of the sample containing the color-holding agent did not disappear when adhered to water alone, for example, when written on a white board, but the surfactants of group D,
For example, sodium alkyl ether sulfate 2 to 2
It was confirmed that the ink was immediately decolored and the ink itself was removed by wiping with the decoloring liquid mixed in 13 parts by weight.

[0039]

As described above, the colored ink of the present invention and the writing system using the same are capable of erasing a written mark by adhering water, and can easily and cleanly correct letters and the like. It also enables the reproduction of erased characters, etc., and can greatly expand the range of use.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a writing instrument using a colored ink of the present invention.

FIG. 2 is the chemical formula of Rhodamine B lactam.

FIG. 3 is a chemical formula of 6-diethylamino-benzo [a] fluorane.

FIG. 4 is a chemical formula of 3-diethylamino-benzo [a] fluorane.

FIG. 5 is a chemical formula of 3-diethylamino-7,8-benzofluorane.

FIG. 6 is a chemical formula of 3-diethylamino-7-chlorofluorane.

FIG. 7 3,3-Bis (1-n-butyl-2-methyl-
Indoyl-3) Chemical formula of phthalate.

FIG. 8 is a chemical formula of 3,3-bis (1-ethyl-2-methyl-indoyl-3) -phthalate.

FIG. 9 3,6-bis (diethylamino) fluorane-
It is a chemical formula of γ- (4-nitro) -anilinolactam.

FIG. 10 is a chemical formula of 3-diethylamino-6-methyl-7-chlorofluorane.

FIG. 11 is a chemical formula of 2-bromo-3-methyl-6-dibutylaminofluorane.

FIG. 12 is a chemical formula of 1,3-dimethyl-6-diethylaminofluorane.

FIG. 13: 1, 3, 3-trimethyl-indolino-7 ′
-Chlor- is the chemical formula of β-naphthospiropyran.

FIG. 14 is a chemical formula of 3-cyclohexylamino-6-chlorofluorane.

FIG. 15: 2- (phenyliminoethanedilidene) -3,3
-Trimethyl-The chemical formula of indoline.

FIG. 16 is a chemical formula of N-acetyl auramine.

FIG. 17 is a chemical formula of N-phenyl auramine.

FIG. 18 is a chemical formula of 2- {2- [4- (dodecyloxy) -3-methoxyphenyl] -ethenyl} quinoline.

FIG. 19 is a chemical formula of 3,6-dimethyloxyfluorane.

FIG. 20 is a chemical formula of malachite green lactone.

FIG. 21 is a chemical formula of 3-diethylamino-7-dibenzoylaminofluorane.

FIG. 22 is a chemical formula of 3-diethylamino-7-chloroanilinofluorane.

FIG. 23 is a chemical formula of 3,6,5′-tri (dimethylamino) fluorene-9-spiro-1 ′-(3′-isobenzofuran).

FIG. 24 is a chemical formula of 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4-azaphthalide.

FIG. 25 is a chemical formula of crystal violet lactone.

FIG. 26 is a chemical formula of benzoyl leuco methylene blue.

FIG. 27 is a chemical formula of ethyl leucomethylene blue.

FIG. 28 is a chemical formula of methoxybenzoyl leuco methylene blue.

FIG. 29 is a chemical formula of di-β-naphthospiropyran.

FIG. 30: 3- (4-Dimethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methylindoyl-3) -4
-The chemical formula of azaphthalide.

FIG. 31: 3- (4-diethylaminophenyl) -3- (1-
Ethyl-2-methylindoyl-3) phthalide is a chemical formula.

FIG. 32 is a chemical formula of 3,7-bis (dimethylamino) -10-benzoylphenocyanazine.

FIG. 33 is the chemical formula for tri (4-dimethylaminophenyl) methane.

FIG. 34 is a chemical formula for 3-cyclohexylmethylamino-6-methyl-7-anilinofluorane.

FIG. 35 is a chemical formula for 3-diethylamino-6-methyl-7-anilinofluorane.

FIG. 36 is the chemical formula for 3-dibutylamino-6-methyl-7-anilinofluorane.

FIG. 37 is the chemical formula for 3-diethylamino-6-methyl-7-kyridenofluorane.

FIG. 38 is a chemical formula for 2- (2-chloroanilino) -6-diethylaminofluorane.

FIG. 39 is the chemical formula for 2- (2-chloroanilino) -6-dibutylaminofluorane.

FIG. 40 is a chemical formula for 2-anilino-3-methyl-6-diethylaminofluorane.

[Explanation of symbols]

 3 colored ink

Claims (8)

[Claims] 1. Adipic acid, ascorbic acid, benzoic acid,
Zinc chloride, calcium chloride, magnesium chloride, thiamine hydrochloride, citric acid, glycolic acid, succinic acid, salicylic acid, tartaric acid, tannic acid, nicotinic acid, lactic acid, glacial acetic acid,
A color-forming aid containing 3 to 15 parts by weight of one or more electron-accepting color developing compounds selected from the group A consisting of fumaric acid, propyl gallate, malic acid, and phosphoric acid, and substantially invisible by the color-forming aid. Of an anhydrous mixed solution containing a color former containing an electron-donating color-forming compound that develops from a colorless color to a visible color, and the handwriting written with this mixed solution is water or water and a surfactant. A colored ink that is erased from a colored color to a colorless color by applying an erasing liquid. 2. The color former is rhodamine B lactam; 6-diethylamino-benzo [
a] Fluoran; 3-diethylamino-benzo [a] fluoran; 3-diethylamino-7,8-benzofluorane; 3-diethylamino-7-chlorofluorane;
3,3-Bis (1-n-butyl-2-methyl-indoyl-3) phthalate; 3,3-bis (1-ethyl-2-)
Methyl-indoyl-3) -phthalate; 3,6-bis (
Diethylamino) fluoran-γ- (4-nitro) -anilinolactam; 3-diethylamino-6-methyl-7-chlorofluorane; 2-bromo-3-methyl-6-dibutylaminofluorane; 1,3-dimethyl -6-diethylaminofluorane; 1,3,3-trimethyl-indolino-7'-chloro-β-naphthospiropyran;3-cyclohexylamino-6-chlorofluorane; 2- (phenyliminoethanedilidene) -3, 3-trimethyl-indoline; N-acetyl auramine; N-phenyl auramine; 2- {2- [4- (dodecyloxy) -3-methoxyphenyl] -ethenyl} quinoline; 3,6-dimethyloxyfluorane; malachite Green lactone; 3-diethylamino-7-dibenzoylaminofluorane; 3-diethylamino-7-chloroanilinofluorane; 3, 6,
5'-tri (dimethylamino) fluorene-9-spiro-
1 '-(3'-isobenzofuran); 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4-azaphthalide; crystal violet lactone; benzoyl leuco methylene blue; ethyl leuco methylene blue; methoxybenzoyl leuco methylene blue; di- β-naphthospiropyran; 3- (4-dimethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methylindoyl-
3) -4-azaphthalide; 3- (4-diethylaminophenyl) -3- (1-ethyl-2-methylindoyl-3) phthalide; 3,7-bis (dimethylamino) -10-benzoylphenocyanazine; Tri (4-dimethylaminophenyl) methane; 3-Cyclohexylmethylamino-6-methyl-7-anilinofluorane; 3-Diethylamino-
6-methyl-7-anilinofluorane; 3-dibutylamino-6-methyl-7-anilinofluorane; 3-diethylamino-6-methyl-7-kyridenofluorane; 2
Selected from the group B consisting of-(2-chloroanilino) -6-diethylaminofluorane; 2- (2-chloroanilino) -6-dibutylaminofluorane; 2-anilino-3-methyl-6-diethylaminofluorane; The colored ink according to claim 1, comprising 5 to 20 parts by weight of one or more electron donative coloring compounds. 3. The colored ink comprises polyvinyl alcohol; polyethylene glycol; alginic acid; alginate; cellulose; cellulose derivative; carboxyvinyl polymer; polyethylene oxide; sodium polyacrylate; tragacanth gum; gum arabic; gelatin; glue; pectin; galactose. The colored ink according to claim 1, which comprises 3 to 15 parts by weight of one or more color-retaining agents selected from the group C consisting of mannan, agar, and starch. 4. The decoloring liquid is sodium alkyl ether sulfate; sodium α-olefin sulfonate; fatty acid alkanolamide; alkylamine oxide; alkyl glycoside; polyoxyethylene alkyl ether; sodium alkylsulfosuccinate; polyoxyethylene alkyl. 2. The colored ink according to claim 1, further comprising 2 to 13 parts by weight of one or more surfactants selected from the group D consisting of allyl ether; polyoxyethylene polyoxypropylene copolymer. 5. Adipic acid, ascorbic acid, benzoic acid,
Zinc chloride, calcium chloride, magnesium chloride, thiamine hydrochloride, citric acid, glycolic acid, succinic acid, salicylic acid, tartaric acid, tannic acid, nicotinic acid, lactic acid, glacial acetic acid,
A color-forming aid containing 3 to 15 parts by weight of one or more electron-accepting color developing compounds selected from the group A consisting of fumaric acid, propyl gallate, malic acid, and phosphoric acid, and substantially invisible by the color-forming aid. Of colorless ink, which is composed of an anhydrous mixed liquid mixed with a color former containing an electron-donating color-forming compound which develops from a colorless color to a visible color, and an erasing liquid consisting of water or water and a surfactant. At the same time, a writing system is characterized in that a writing trace written with the colored ink is erased from colored to colorless by applying the decoloring liquid. 6. The color former is rhodamine B lactam; 6-diethylamino-benzo [
a] Fluoran; 3-diethylamino-benzo [a] fluoran; 3-diethylamino-7,8-benzofluorane; 3-diethylamino-7-chlorofluorane;
3,3-Bis (1-n-butyl-2-methyl-indoyl-3) phthalate; 3,3-bis (1-ethyl-2-)
Methyl-indoyl-3) -phthalate; 3,6-bis (
Diethylamino) fluoran-γ- (4-nitro) -anilinolactam; 3-diethylamino-6-methyl-7-chlorofluorane; 2-bromo-3-methyl-6-dibutylaminofluorane; 1,3-dimethyl -6-diethylaminofluorane; 1,3,3-trimethyl-indolino-7'-chloro-β-naphthospiropyran;3-cyclohexylamino-6-chlorofluorane; 2- (phenyliminoethanedilidene) -3, 3-trimethyl-indoline; N-acetyl auramine; N-phenyl auramine; 2- {2- [4- (dodecyloxy) -3-methoxyphenyl] -ethenyl} quinoline; 3,6-dimethyloxyfluorane; malachite Green lactone; 3-diethylamino-7-dibenzoylaminofluorane; 3-diethylamino-7-chloroanilinofluorane; 3, 6,
5'-tri (dimethylamino) fluorene-9-spiro-
1 '-(3'-isobenzofuran); 3,3-bis (4-diethylamino-2-ethoxyphenyl) -4-azaphthalide; crystal violet lactone; benzoyl leuco methylene blue; ethyl leuco methylene blue; methoxybenzoyl leuco methylene blue; di- β-naphthospiropyran; 3- (4-dimethylamino-2-ethoxyphenyl) -3- (1-ethyl-2-methylindoyl-
3) -4-azaphthalide; 3- (4-diethylaminophenyl) -3- (1-ethyl-2-methylindoyl-3) phthalide; 3,7-bis (dimethylamino) -10-benzoylphenocyanazine; Tri (4-dimethylaminophenyl) methane; 3-Cyclohexylmethylamino-6-methyl-7-anilinofluorane; 3-Diethylamino-
6-Methyl-7-anilinofluorane; 3-dibutylamino-6-methyl-7-anilinofluorane; 3-diethylamino-6-methyl-7-kyridenofluorane; 2
Selected from the group B consisting of-(2-chloroanilino) -6-diethylaminofluorane; 2- (2-chloroanilino) -6-dibutylaminofluorane; 2-anilino-3-methyl-6-diethylaminofluorane; 6. The writing system according to claim 5, comprising 5 to 20 parts by weight of one or more electron donative coloring compounds. 7. The colored ink comprises polyvinyl alcohol; polyethylene glycol; alginic acid; alginate; cellulose; cellulose derivative; carboxyvinyl polymer; polyethylene oxide; sodium polyacrylate; tragacanth gum; gum arabic; guar gum; gelatin; glue; pectin. ;
The writing system according to claim 5, comprising 3 to 15 parts by weight of one or more color-retaining agents selected from the group C consisting of locust bean gum, galactose mannan, agar, and starch. 8. The decolorizing liquid is sodium alkyl ether sulfate; sodium α-olefin sulfonate; fatty acid alkanolamide; alkylamine oxide; alkyl glycoside; polyoxyethylene alkyl ether; sodium alkylsulfosuccinate; polyoxyethylene alkyl. 6. The writing system according to claim 5, wherein 2 to 13 parts by weight of one or more surfactants selected from the group D consisting of allyl ether; polyoxyethylene polyoxypropylene copolymer;