Celebrating 100 a century. Cotton. Wool. Nylon. +more. Non-toxic. Safe for sewage & septic systems. Rit will Dye: Cotton. Linen. Rayon. Silk. Wool. Nylon. Stovetop method is suggested when dyeing nylon. Conforms to ASTM D-4236. ritdye.com. ritdye.com/washingmachine. Before dyeing visit ritdye.com for detailed instructions and a library of over 500 color recipes. Visit ritdye.com/washingmachine for detailed instructions. Made in the U.S.A of U.S. & imported materials.