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Answer the following questions: Why does leather get hardened after tanning?

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Colloidal nature of animal skins is there.
Mutual coagulation occurs when a hide with positively charged particles is bathed in tanning, which includes negatively charged colloidal particles.
Leather hardens as a result of this.

Final answer:
Hence, leather gets hardened after tanning as mutual coagulation occurs when a hide with positively charged particles is bathed in tanning, which includes negatively charged colloidal particles.

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