Urea is also a great dissolving agent and helps dissolve those "stubborn" colors that leave a residue or "freckles" of un-dissolved dye on your work. Just use warm Urea water (1 TBS per Cup) to paste up your dye to get it more thoroughly dissolved. Helps to dissolve more solids into less liquids so great for making the really concentrated solutions you need for tie dye and dye painting, especially the darker colors.
You need about 1/4 cup per quart of dye solution for tie-dye, and about 3/4 cup per quart of chemical water for direct application.