Color sampling is carried out preparing the mixture by mixing the colors out of the drum. Little additions of color useful to change the tone of the sample can be made directly in the drum during the penetration dyeing, without running the risk of staining the leather. These additions in progress, however, may be performed only if the tone to be corrected is close to the original sample, regarding both dyeing yield and color shade. To intensify and correct the color flame, is always possible to do an additional top dyeing.
As in the case of a normal dyestuff, the dyeing yield is influenced by the type of retanning and by the article to obtain.
It’s recommended, as in the traditional procedure, a preliminary test on the leather surface; in this way it can be experimentally observed what is the percentage of INK FOR LEATHER color to use.