I don't print allot of Comfort Colors Brand shirts, they are pigment dyed. I had a grey shirt with a black spot on the back, so I use my spot gun which has Tex-out spot remover chemical in it. I tried removing the spot which would not remove, I think it was made into the fabric. Anyway not only did the spot not come out, but where the spot removal chemical was sprayed it turned dull white. My question not being familiar with pigment dye products (Is it not safe to use spot remover on pigment dye). Thanks in advance.