| http://www.w3.org/ns/prov#value | - The present invention relates to a method for making collagen sponge with a velour-like surface which is insoluble, but highly swellable, in water, particularly for use for medical or cosmetic purposes, wherein the collagen-containing tissue serving as raw material, after being dehaired and freed of scar tissue layers, is digested by an alkali and/or acid denaturing process and possibly an enzymat
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