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Which of the following use in hardening ...

Which of the following use in hardening of leather?

A

Light sensitive silver bromide in gelatin

B

Sodium lauryl sulphate

C

Alum

D

Tannin

Text Solution

Verified by Experts

Animal leather is colloidal in nature and has positively charged particles. When it is soaked in tannin, a negatively charged colloid, it results in mutual coagulation and gets harden. Thus, leather get hardened after tanning.
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