CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING

**Definition:** This place covers:

Preparatory steps prior to tanning.

Chemical aspects of tanning (chemical compounds).

Impregnation of leather.

Coating of leather with polymers.

Devices such as drums for the chemical treatment of hides, skins or leather.

**Limiting references (this place does not cover):** - Gelatine for foodstuff -> A23J1/10 - Layered products next to a fibrous layer -> B32B - Peptides or collagen -> C07K14/78 - Macromolecular products derived from leather -> C08H1/06 - Polishing compositions -> C09G1/00 - Preparation of glue or gelatine from leather scrap -> C09H1/04 - Enzymes and Compositions thereof -> C12N9/00 - Mechanical treatment or processing of skins, hides or leather -> C14B - Artificial leather -> D06N3/00 - Dyeing of leather -> D06P3/00

**Glossary:** - Liming: Treatment of hides or skins with lime solution or other alkalis e.g. caustic soda to destroy the hair or wool, remove proteins and fat - Pelt: Hide or skin in the dehaired or dewooled, limed, fleshed, perhaps bated (delimed) and scudded condition; Ready for tanning - Raw hide: Product made from bovine hides, freed from the hair and the flesh layer and dried out in the limed state - Suede: Leather with a velvet-like surface - Wet-blue: Hide or skin, subjected to the usual beamhouse processes, chrome-tanned and left wet