For best results use with natural fabrics. Yeah, that would have been nice to have read BEFORE we decided to tie dye today. I was at the Dollar Tree over the weekend and found some plain white pillowcases. We have an upcoming road trip this weekend and I thought it would be fun for the girls to decorate their own pillowcase. Just to let you know, the pillowcases are 100% polyester  (hey it was a dollar, what did I expect?) and NOT tie dye friendly!