Celebrating 100 a century. Cotton. Wool. Nylon. + more. Rit Will Dye: Cotton. Linen. Rayon. Silk. Wool. Nylon. Non-toxic. Safe for sewage & septic systems. 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 USA. of US. & imported materials.