Fiber reactive dye. For dyeing cellulose materials, such as cotton, linen, rayon, or hemp, fiber reactive dyes are the best. They are brighter and more wash-fast than all-purpose or direct dye, and they work even in cool water, 70 degrees F (21 C) or above, which has obvious advantages in not causing shrinkage and not requiring extra heating of the water. Good examples of fiber reactive dyes include Procion MX, Cibacron F, and Drimarene K.Procion MX dye is readily obtained by mail order from most of the companies listed on my Sources for Dyeing Supplies page, while Cibacron F is available under the brand name of Sabracron F, from PRO Chemical & Dye. Drimarene K is the type of dye found in Dylon Machine Dye, commonly available in Europe but not the US; this dye is promoted as being formulated for use in front-loading washing machines. Drimarene K is also available from Batik Oetoro in Australia.