Put a light coat of neetsfoot oil on it and let it sit 12 hrs min. Hard to take any staining or discoloration off veg tan. If it gets water spot on it wet whole piece so it discolors at same time. Black spots from iron can sometimes be removed with bar keepers friend.(oxcilic acid). You can oil before or after dyeing or both. A little goes a long way with neetsfoot. Dye will dry it out even more.