UMITAN RS / CU LIQ. Can be used alone or in combination with natural and synthetic tannins, which are added to the same bath. UMITAN RS / CU imparts to leather grain firmness and exceptional fullness and roundness of hand. The percentages of use are from 3 to 6% on the weight of the hides shaved, depending on the type of leather and of their thickness. It is also used at the end after the fattening for maximum effect.