Please Note: These swatch colors are a representation of the actual dye. Colors may vary due to your computer settings. Please test colors before beginning a project requiring an exact color match. PRO MX Reactive Dyes (Procion) are designed to permanently dye cellulose fibers at room temperature, 75° - 95° F (24°C to 35°C). They also dye protein fibers like wool, using acid at a boil or with steam. This is the most reactive of all types of dyes and most versatile with excellent wash and light fastness properties. Work in a well ventilated area; wear a disposable dust/mist respirator if you dye fabric occasionally. If you dye fabric on a regular basis wear a MSHA/NIOSH approved respirator with cartridges for dusts, mists, and fumes. Download complete safety guidelines »