Dyespin™ Plus. For the traditional reactive dyeing process you will need dye powder, soda ash, urea (opt.), fabric detergent (opt.), dust mask, gloves, and safety glasses. Dye Mixing: For the color swatch, we used 2 tsp Royal Purple dye powder to 1/2 cup warm water with 1/2 tsp urea. [Royal Purple is a homogeneous dye.] Use your own reactive dye procedure or one of the dyeing procedures from the links below. Have fun dyeing!