Pigmented Leather

Anionic dyes (brilliant acid dyes) and solvent dyes (unsulfonated metal-complex and other solvent-soluble dyes for brilliant shades) are used for shade correction. 

The Colour Index (C.I.) is almost exclusively a listing of textile dyes (and pigments), and dyes for leather appear only in a supplementary chapter and are classified mostly as acid, direct, and mordant dyes [2], About 1500 leather dyes are listed in the Colour Index (Table 5.1), with more then 1000 acid and more than 

250 direct dyes. However, an even larger number, including many mixtures, are suitable for leather. Conversely, not all the dyes listed are manufactured and commercially available nowadays. The chemical structure of many dyes recorded in the Colour Index has not been reported ca. two-thirds of leather browns and blacks have an undisclosed structure. 

Class Number Aniline leather Pigmented leather 

The most important leather dyes identified by typical chemical nomenclature are azo, stilbene, triaiylmethane, quinoline, azine, oxazine, thiazine, sulfur, and phthalocyanine. 

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Uses. The most important areas of use of pigments are paints, varnishes, plastics, artists colors, printing inks for paper and textiles, leather decoration, building materials (cement, renderings, concrete bricks and tiles—mostly based on iron oxide and chromium oxide pigments), leather imitates, floor coverings, rubber, paper, cosmetics, ceramic glazes, and enamels. 

Class Number Aniline leather Pigmented leather... 

Chromium compounds, mostly in chromium(III) or chromium(VT) forms, produced by the chemical industry are used for chrome plating, the manufacture of dyes and pigments, leather tanning, and wood preserving. Smaller amounts are used in drilling muds, rust and corrosion inhibitors, textiles, and toner for copying machines. For more information on the physical and chemical properties and on the production and use of chromium, see Chapters 3 and 4. 

Dyes and color pigments Leather tanning and leather processing Rayon and synthetic hber manufacturing Sodium/potassium cyanide-associated industries Basic drugs manufacturing Foundry industries Storage batteries (lead acid type)... 

Hazard Toxic material. TLV 0.5 mg(Cr)/m3. Use Inks, dyeing, paint pigment, leather tanning, other chromates, protection of iron against corrosion, wood preservative. 

Industrial nations in Europe and North America must rely on a supply of chromium ore from abroad, the US consuming 14% of world output. Because chromium is such a vital metal to the economy, government stockpiles in the US are considered an important strategy to ensure supplies during periods of military activity. Chromium ore is converted to chromium ferroalloys (for stainless steel and other alloys), chromite-containing refractory materials and chromium-based chemicals. The most important commercial applications of the latter are for pigments, leather tanning and wood preservation. 

Uses Emulsifier, dispersant, stabilizer for agric. insecticides/herbicides, latex polymerization, iodophor mfg. for germicidal cleaning, latex paints, dye pigments, leather emulsifier for silicone oils, diacyl peroxides Regulatory FDA, EPA compliance... 

FIremIst Vegetable Black Olive pigment, leather finishes... 

Methyl hydroxyethylcellulose Zinc sulfide pigment, leather cloth... 

Sources. Chromium is used in paints, pigments, leather tanning, and wood preservatives. 

Chromium is present in the environment in several different forms. The most common forms are Cr(0), Cr(III) and Cr(VI). No taste or odor is associated with chromium compounds. Cr(III) occurs naturally in the environment and is an essential nutrient. Cr(VI) and Cr(0) are generally produced by industrial processes. The metal chromium, which is the Cr(0) form, is used for making steel. Cr(VI) and Cr(III) are used for chrome plating, dyes and pigments, leather tanning by means of... 

Ifralan S8 Tallicin 2500 wetting agent, pigments leather... 

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