abeltv

hi all who could help me, I have the following problem, I crafted a portfolio and leather moleskin but it generated a white powder on the surface of salt. someone knows why?, even before having used dye, english tan from angelus, but I do not believe it's this my problem because the dye I have used on something else . what I can do to eliminate this problem. I clean the surface and the white salt its gone but I have fear that this residue damage my ipad or pc