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Home » Dyestuff » Leather Dyes

Leather Dyes

Leather Dyes
Leather dyes offered involve use of spirit/alcohol based dyes. This is done as alcohol quickly gets absorbed into moistened leather. As leather dyeing formulation is similar to lacquer, it consist of :
  • Dye or pigment
  • Casein/ nitrocellulose resin
  • Solvent

The dyestuffs used in tanneries vary depending on product range required along with dictates of the emerging market. With each tannery using between 50-100/more different types of dyestuffs, the leather industry primarily makes use of anionic dyestuffs which are divided under following families:
  • Acid dyes
  • Mordant dyes
  • Direct dyes
  • Basic Dyes, its use is also limited.
  • Pre-metallic dyes
  • Solubilised sulphur dyes
  • Reactive dyes although a part of the anionic group of dyes but use limited to a certain extent.

From chemical point of view, the dyes that are used are mostly :
  • Azo Dyes
  • Anthraquinone Dyes
  • Triphenylmethane Dyes

Technology Changes in Leather Dye :
The use of high temperatures helps in releasing fat-soluble components of conventional leather dyes from their chemical bonds. These released components have tendency to migrate upwards into layers where task is to provide a smooth finish to leather surface. This causes visible change of:
  • Color
  • Intensity

With rising humidity, it is likely that water soluble non-permanent dyes and those having low molecular weight would be washed out. But with latest technology of dyeing leather, development as well as production of fastness in dyes has reached top level.

Few tests that are undertaken for testing the color fastness of dyed leather are as follows:
  • Color Fastness with regard to migration into plasticized Poly Vinyl Chloride
  • Fastness to light the standard Xenon lamp test
  • Fastness towards mild washing
  • Fastness towards washing by machine
  • Fastness towards perspiration
  • Fastness to test of rubbing
  • Fastness in water
  • Fastness with respect to water spotting
  • Grey scale test to ascertain the change of color and staining
  • Solubility capacity of powder dyes
  • Stability of dyes with regard to
  • Acid
  • Alkali
  • Hard water

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