So many choices... I tried the five most widely available fabric dyeing options: natural dyeing with parsley, kale, and grass, and chemical dyes Procion (a fiber reactive dye), Rit, Dylon (def not Drylon) and iDye, all in an attempt to dye 8 t shirts an acceptable shade of rich, lush green for an upcoming project. Lots of stirring, heating, and more chemical shenanigans than I'm comfortable with ensued.