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Leather Dyes

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Leather dyeing usually involves the use of spirit or alcohol based dyes where alcohol quickly gets absorbed into moistened leather. Leather dyeing formulations are similar to lacquers. They consist of a dye or pigment, a casein or nitrocellulose resin, and a solvent.

The types of dyestuff that are used by tanneries generally varies depending on the product range needed along with the dictates of the fashion world. It is a fact that each tannery uses between 50-100 or more different types of dyestuffs.

The leather industry primarily uses anionic dyestuffs, that can be divided in the following families:

If we see from the chemical point of view the dyes used are mostly Azo dyes, Anthraquinone dyes and Triphenylmethane dyes. Commercially speaking, popular Black dyes account for nearly 60-70% of all leather dyeing. Also, out of this a dye variety called Acid Black 210 dominates with 80-90% usage of all of the black dyes used.

Latest in Leather Dye: Development of High Fastness Dyes

Applying high temperatures releases the fat-soluble components of conventional leather dyes out of their chemical bonds. Now these components has a tendency to migrate upwards into the layers whose task is to give the smooth finish to leather surface. This causes a visible change of color and intensity. What happens is that with the rising of humidity, it is quite likely that non-permanent dyes that are water-soluble, and low in molecular weight, will be washed out. Along with the problems like spotting and discoloration. Also there is the risk that migrating dye components can rub off on other materials such as plastics or textiles.

With latest technology of dyeing leather, the development and production of high-fastness dyes reached on top level. Now, the manufacturers get high quality leathers for making leather products.

Here is a flow chart that describes the process criteria of selection of leather dyes :

Leather Dyes

Criteria for determining the Color Fastness of Dyed Leather

Few tests that are undertaken for testing the color fastness of dyed leather are as follows

Colour Index | Dyes | Pigments | Applications | Glossary | FAQ's | Buyers Guide | Global Dyestuff Industry

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