(1) Red, orange, yellow acid dyes Among the developed acid environmental protection dyes, the red acid dyes are: C.I. Acid Red 37, C.I. Acid Red 89 (Weak Acid Red 3B, 2BS), C.I. Acid Red 145 (Weak Acid Red GL), etc. The C.I. Acid Red 336 and C.I. Acid Red 361 are important varieties of red color spectrum. And C.I. Acid Red 336 and C.I. Acid Red 361 are important varieties in the red color spectrum. Orange acid dyes include: C.I. Acid Orange 67 (Weak Acid Yellow RXL), C.I. Acid Orange 116 (Acid Orange AGT), C.I. Acid Orange 156 (Weak Acid Orange 3G). Yellow acid dyes are mainly: C.I. acid yellow 42 (weak acid yellow Rs, acid yellow R) and C.I. acid yellow 49 (acid yellow GR200).

(2) Blue, green and purple acid dyes Most of the environmentally friendly acid dyes in the blue spectrum are bromine derivatives, and there are more new varieties of blue color, such as C.I. Acid Blue 277, C.I. Acid Blue 344, C.I. Acid Blue 350, C.I. Acid Blue 9 (Brilliant Blue FCF) and so on. The green acid dyes are anthraquinone type, and the new products that have been developed in China are C.I. Green 17, C.I. Acid Green 28, C.I. Acid Green 41, C.I. Acid Green 81, etc. The purple ones are mainly C.I. Acid Blue 344, C.I. Acid Blue 350, C.I. Acid Blue 9 (Brilliant Blue FCF) and so on. The purple color is mainly C.I. Acid Violet 17 (Acid Violet 4BNS), C.I. Acid Violet 54 (Weak Acid Brilliant Red 10B), C.I. Acid Violet 48 and so on.

(3) brown, black acid dyes brown acid dyes new varieties are also more, the more important is C.I. acid brown 75, C.I. acid brown 98, C.I. acid brown 165, C.I. acid brown 348, C.I. acid brown 349 and so on. The black varieties mainly include C.I. Acid Black 26, C.I. Acid Black 63, C.I. Acid Black 172, C.I. Acid Black 194, C.I. Acid Black 210, C.I. Acid Black 234, C.I. Acid Black 235, C.I. Acid Black 242 and so on.