![]() ![]() It is also known as "wet blue" for the pale blue color of the undyed leather. Chrome-tanned leather is tanned using chromium sulfate and other chromium salts.Historically, it was occasionally used as armor after hardening, and it has also been used for book binding. Boiled leather is an example of this, where the leather has been hardened by being immersed in boiling water, or in wax or similar substances. In hot water, it shrinks drastically and partly congeals, becoming rigid and eventually brittle. Vegetable-tanned leather is not stable in water it tends to discolor, and if left to soak and then dry, it shrinks and becomes harder, a feature of vegetable-tanned leather that is exploited in traditional shoemaking. ![]() The color tan derives its name from the appearance of undyed vegetable-tanned leather. It is supple and light brown in color, with the exact shade depending on the mix of materials and the color of the skin.
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