Classification according to the main finishing material used

Casein finish
Treatment with non-thermoplastic casein products and pigments or organic dyes. It is mainly used for glaze/plate finish high gloss leather.
Polymer or binder finish
This is the most commonly used type of finish in leather production and is mainly applied as thermoplastic binders on the basis of polyacrylates, butadiene or vinylidene chloride copolymers. The film –forming properties of these product are adjusted to produce a wide range of effects from soft/stretchy to hard/inelastic, depending on the degree of polymerization.
Nitrocellulose or collodion finish
The film forming material is nitrated cellulose cotton dissolved in organic solvents, also called collodion cotton. It is applied to binder base coats in a pigmented or transparent thin layer.