1. Oil soluble red, an industrial dye, is mainly used for shoe polish, flooring, candles and other industrial products. This industrial dye samples called oil soluble red, after the China Academy of Inspection and Quarantine Science and Technology Food Safety Research Institute test recognized that its main ingredient is Sudan red Ⅳ.

2. Sudan Red, known as Sudan, *** divided into Ⅰ, Ⅱ, Ⅲ, Ⅳ, are industrial dyes. In last year's sensational national Sudan red event, including 30 enterprises of 88 food samples have been detected containing Sudan red Ⅰ. Compared with Sudan Red I, Sudan Red IV is not only redder in color, but also more toxic. The International Agency for Research on Cancer (IARC) classified Sudan Red IV as a Group III carcinogen.