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Don't forget that the old soaps were tallow rich, and there are not that many about these days - wool fat soaps have tallow in them (Mitchells has wool fat, which is lanolin, plus tallow).

Also,...

The fibres in leather are what make it pliable. They contain a small amount of moisture, even after tanning and drying, so they can stretch and contract a little with no deformation. In fact,...