How did you die it? I made up some vinagroon and died a holster, once it was black I dunked it in the baking soda and water mixture, when it started to dry the white started coming out, thought at first it was the leather, Tandy brand, took a scrap piece and did it again, this time though I did not rinse it and there was no white residue, the only thing I could figure was I used too much baking soda and the leather soaked it up and then it leached out when it dried.