"Stretching" is done while the leather is limp or softened up at the end of dwell time. Unnatural creases if any is stretch cross-wise to minimize the unwanted creases. Hydrating one of its purposes is to precondition the leather structure to facilitate the replenishing of diminishing fatliquor (fat, oil and water) more efficiently. Fat plumps the leather structure for fullness, oil lubricates the interconnecting fibrils with smoothness and strength and the water leaves to impart air spaces for leather natural transpiration characteristic.
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