tanned skin

Preferred label: 

An animal skin that has been treated with tanning agents to turn it into leather and which, before the 19th century, will be derived only from vegetable sources such as the bark of oak trees, sumac, etc. Because the term leather has been used historically of both alum-tawed and tanned skins, it is safer, wherever there might be confusion, to used the term tanned skin rather than leather, though properly-speaking, they both have the same meaning.

AAT

The Arts and Architecture Thesaurus Online, The Getty Research Institute.

Additional reference: 
http://vocab.getty.edu/aat/300011845 (modified)

Middleton (1994, 4th ed.)

Bernard Middleton, A history of English Craft Bookbinding Techniques, New Castle, London, Oak Knoll Press, The British Library, 1994 (4th ed.)

Additional reference: 
p. 117
Alternative label: 
leather
Broader concept: 
Broader partitive concept: 
Top concept: 
materials
Getty AAT: