S.No Name of dye Class of dye λmax nm Structure of dye
1. Malachite Green Triarylmethane 618
2. Naphthol Green B Nitroso 714
3. Toudine Blue Thiazin 626
4. Methyl Blue Triarylmethane 607
5. Ponceau BS Azo (di) 505
6. Amido Black Azo (di) 618
7. Congo Red Azo (di) 497
8. Eriochrome Black T Azo (mono) 560
9. Drimarene Black CL BGR Azo (di) 597
10. Reactive Black 5 Azo (di) 597
11. Thiazole Yellow G Azo (mono) 402
12. Trypan Blue Azo (di) 607
13. Crystal Ponceau 6R Azo (mono) 510
14. Drimarene Red CL 4BN Azo (mono) 532
15. Drimarene Yellow CL 4R Azo (mono) 400
16. Acid Red 40 Azo (mono) 506
17. Orange G Azo (mono) 475
Table 1: Classification of dyes and their Structures.