cuir bouilli

Boiled leather, sometimes called cuir bouilli, was an historical construction material for armour. It consists of thick leather, boiled in water (some sources hold that oil and wax were used as well, others posit the use of ammonia from fermented animal urine). The boiling causes the leather to become hard and slightly brittle, gaining some resemblance to the properties of wood. Since the leather remains flexible and stretchable a short time after the boiling, forming it to the needs of the armourer is quite easy, making it an alternative to bronze, steel, and other materials.
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cuir bouilli
\cuir" bou`illi"\ (?). [f.] in decorative art, boiled leather, fitted by the process to receive impressed patterns, like those produced by chasing metal, and to retain the impression permanently.

leather hardened in boiling wax