However, several new types of dyes had to be developed for more - modern synthetic materials such as acetate rayon, polyester, nylon, and acrylic fiber.
इसलिए उस वक्‍त मौजूद ज़्यादातर रंग रेयॉन को रंगने के लिए इस्तेमाल किए जाते थे ।