US100997A - Improvement in removing colors from leather - Google Patents
Improvement in removing colors from leather Download PDFInfo
- Publication number
- US100997A US100997A US100997DA US100997A US 100997 A US100997 A US 100997A US 100997D A US100997D A US 100997DA US 100997 A US100997 A US 100997A
- Authority
- US
- United States
- Prior art keywords
- leather
- improvement
- acid
- coloring
- removing colors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000010985 leather Substances 0.000 title description 42
- 239000003086 colorant Substances 0.000 title description 4
- 239000002253 acid Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 10
- 239000003513 alkali Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000001263 FEMA 3042 Substances 0.000 description 4
- 229940033123 Tannic Acid Drugs 0.000 description 4
- LRBQNJMCXXYXIU-NRMVVENXSA-N Tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 4
- 239000000284 extract Substances 0.000 description 4
- 230000000266 injurious Effects 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 235000015523 tannic acid Nutrition 0.000 description 4
- 229920002258 tannic acid Polymers 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 210000002303 Tibia Anatomy 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- 239000001117 sulphuric acid Substances 0.000 description 2
Classifications
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
Definitions
- My invention has for its object to enable me to remove, or partially remove, the coloring-matter and other foreign substances from leather, so as to render it light colored, and consistsin subjecting the leather first to an alkaline solution, which extracts the coloring natter, 860., and afterwards to an acid solution, which removes itfrom the surface of the leather, so that itscolor and general appearance when dry will be improved to a great degree, while no injurious effects are produced upon the leather, as the alkali and acid neutralize each other.
- I first make an alkaline solution by dissolving from six to seven pounds of Sal-soda, inoue hundred gab. lons of water, at a temperature of about 100 Fahrenheit. The leather is then dipped into this-alkaline solution, and after being removed therefrom is innuediately dipped into a solution formed by mixing from six to seven pounds of sulphuric acidwith one hundred gallons of water. The leather is then removed, rinsed in cold water, and hung up to dry.
- the alkaline solution partially extracts the coloringmatter, gums, and other 'foreign substances, which have passed into the leather with the tannicacid during the process of tanning, and the acid removes this matter from its surface, so that when dry it will be clear and bright, and of a much lighter color than before being treated, no injurious elfects being produced upon the leather, as the alkali and acid neutralize each other, while the removal of the coloring-matter, gums, &'c., greatly improves the quality of'the leather.
- dark-colored leather I Y which could only be used for inferior purposes, can be partially decolorized or rendered many shades lighter than before, in consequence of which it will be much more saleable, andwill command a higher price than it would before being treated, as it can bccmployed for any purpose to which the class of leather is applicable.
- the leather after being tanned may be removed from the vat while being tanned, and subjected to my decolorizing process, which will open the pores of the leather, so that more tauuic acid will be admitted, which willrender the leather more solid, and thereby improve its quality.
Description
I waited stttts can (tibiae.
Letters Patent N 100,997, dated March 22, 1870.
IIVIIIPIIROVIIMEN'J." IN REMOVING COLORS FROM-LEATHER.
The Schedule referred to in these Letters IPatenl: and making part of the same.
To all whom it may concern Be it known that I, EDWARD S. FRYE, of Salem, in the county of Essex and State of Massachusetts, have invented a Process of Clcaring Leather, or Removing the Coloring-lilatter therefrom; and I hereby declare that the lbllowing is a full, clear, and exact description thereof.
In the process of tanning, much coloring-matter, gums, and other foreign substancesoften pass into the hide with the tannic acid, rendering the leather dark colored, and injuring itsqnality.
This dark colored leather is much less desirable, and does not connnand so high a price as that of alight color, for the reason that it cannot be so generally used for all purposes to which the class of leather is adapted. y 1
' My invention has for its object to enable me to remove, or partially remove, the coloring-matter and other foreign substances from leather, so as to render it light colored, and consistsin subjecting the leather first to an alkaline solution, which extracts the coloring natter, 860., and afterwards to an acid solution, which removes itfrom the surface of the leather, so that itscolor and general appearance when dry will be improved to a great degree, while no injurious effects are produced upon the leather, as the alkali and acid neutralize each other.
To enable others skilled in the art to understand and use my invention, I will proceed to describe the manner in which I have carried it out.
I first make an alkaline solution by dissolving from six to seven pounds of Sal-soda, inoue hundred gab. lons of water, at a temperature of about 100 Fahrenheit. The leather is then dipped into this-alkaline solution, and after being removed therefrom is innuediately dipped into a solution formed by mixing from six to seven pounds of sulphuric acidwith one hundred gallons of water. The leather is then removed, rinsed in cold water, and hung up to dry.
The alkaline solution partially extracts the coloringmatter, gums, and other 'foreign substances, which have passed into the leather with the tannicacid during the process of tanning, and the acid removes this matter from its surface, so that when dry it will be clear and bright, and of a much lighter color than before being treated, no injurious elfects being produced upon the leather, as the alkali and acid neutralize each other, while the removal of the coloring-matter, gums, &'c., greatly improves the quality of'the leather.
By means otithe above process, dark-colored leather, I Y which could only be used for inferior purposes, can be partially decolorized or rendered many shades lighter than before, in consequence of which it will be much more saleable, andwill command a higher price than it would before being treated, as it can bccmployed for any purpose to which the class of leather is applicable.
I prefer to use sal-soda and sulphuric acid, as they are the cheapest alkali and acid, but any chemical equivalents thereof in the proper proportions may be used instead. p
I iind in practice that it is sufficient to dip the leather into the alkaline and acid solutions, and allow it to remain in each for a few moments only.
Instead of treating the leather after being tanned, it may be removed from the vat while being tanned, and subjected to my decolorizing process, which will open the pores of the leather, so that more tauuic acid will be admitted, which willrender the leather more solid, and thereby improve its quality.
C laim.
1870. EDWARD S. FRYEL Witnesses:
P. E. TESOHEMACHER,
W. J. CAMBRIDGE.
Publications (1)
Publication Number | Publication Date |
---|---|
US100997A true US100997A (en) | 1870-03-22 |
Family
ID=2170464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US100997D Expired - Lifetime US100997A (en) | Improvement in removing colors from leather |
Country Status (1)
Country | Link |
---|---|
US (1) | US100997A (en) |
-
0
- US US100997D patent/US100997A/en not_active Expired - Lifetime
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US100997A (en) | Improvement in removing colors from leather | |
US4039281A (en) | Method for the preparation of leather and fur skins | |
US1410344A (en) | Process for producing color effects | |
US644482A (en) | Tanning process. | |
USRE3864E (en) | Improvement in compounds for treating- hides and skins | |
US1027953A (en) | Bleaching straw. | |
US1340721A (en) | Process for detanning chrome-leather | |
US133021A (en) | Improvement in modes of tanning hides | |
US120393A (en) | Improvement in dyeing and printing madder colors | |
US658032A (en) | Combined tanning and dyeing process. | |
US780924A (en) | Process of dyeing silk. | |
US118089A (en) | Improvement in tanning | |
US104259A (en) | Island | |
DE442233C (en) | Process for neutralizing leather after tanning or after bleaching | |
US1337306A (en) | Treating broom-corn | |
US102760A (en) | Improvement in bleaching, tanning, and coloring sponges | |
US103291A (en) | Improvement in varnish for tinware | |
US381730A (en) | Joseph townsenb | |
US722857A (en) | Tanning process. | |
US385222A (en) | Tanning process | |
DE863051C (en) | Process for the production of capillary-active substances | |
US221187A (en) | Improvement in processes for removing extractive matters from tanned leather | |
DE391315C (en) | Process for tanning animal skins | |
US101283A (en) | Oscar loew | |
US1379175A (en) | Solvent for dyestuffs |