define... how leather is made .
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Primary tanning converts pre-tanned hides into leather by preserving and halting the decomposition of the hide. Hides are loaded into a tanning drum along with a solution of chromium salts or vegetable tanning agents and rotated up to eight hours. The salts and tanning agents preserve the leather as well as soften it.
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Primary tanning converts pre-tanned hides into leather by preserving and halting the decomposition of the hide. ... Vegetable tannage is the conversion of rawhide into leather with vegetable tanning agents. This process produces leather with greater body and firmness than the more general method of chromium tanning.
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