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Oil on leather can occur during fat-liquoring process in the wet-end. This process imparts oil into the leather fibres in order to impart particular softeness or "oily" touch required by the tanner.

During the dry-end or finishing process, mineral oil can be imparted onto the leather crust through spray process or generally, roller-coating process. The reason is generally for fashion or water-resistant requirement.

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13y ago

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