Since 1969, Dharma Fiber Reactive Procion Dye has been the #1 dye of choice for professionals and enthusiasts seeking exceptional results in tie-dye, ice dye, and more. Perfect for use on all cellulose fibers like cotton, rayon, hemp, linen, bamboo, and Tencel. This is the dye used to make the vibrant, eye-catching, professional quality tie-dyed and ice-dyed clothing you've seen on the street, in stores, and at fairs, festivals, and concerts. Dharma Dyes don't fade, even after repeated washings - the brilliant colors are washfast, colorfast, and permanent. They are non-toxic, safe, and easy to use at room temperature. IMPORTANT NOTE: Soda Ash (sold separately) is required to use Dharma Dyes (soda ash chemically bonds the dye to the clothing fibers, making the dye permanent). Keep in mind that online color swatches may vary slightly due to screen differences and there are many ways to use Dharma Dyes. If you need a very specific color, a little testing is recommended.