Our innovative Rainbow yarns offer eye-popping dye colors for your customers, and maximum flexibility for you. Rainbow is a pre-treated, high-grade cotton yarn that dyes in much deeper shades than traditional untreated cotton. That’s thanks to Rainbow technology, developed here at Buhler and based on a treatment that fundamentally changes the dyestuff absorption of the fiber. Best of all, trendy or seasonal colors can be manufactured quickly and in small lots, reducing your risk of ending up with more inventory than you can sell.