This is a step by step visual for how Corky dyed a purple geode style tie dye shirt. You can view the whole video on Youtube. 

The purple tie dye color on this shirt is Nebula Procion MX dye by Jacquard Products. You can get it in the new ice dye kits or in the large jar size.

This shirt was tied with artificial sinew, presoaked in soda ash solution, spun out in the spin dryer, set up on a rack for drainage, and dyed with ice and the purple dye color, Nebula.

Dye was sprinkled under and over the ice to inrease detail next to the sinew tie lines.