METHOD FOR IDENTIFICATION OF AZO DYES 229

DISULFO COLOURS Structure B Structure C 'øJ i o• os o4 o• o• I o, R• o,o POSITION 6 S • ,. each •uc•eu• 6 8 Im each 3 6 Figure 3.--Influence of position of sulfo groups in migration of tested dyes in monophasic neutral solvents. (All dyes have two sulfo groups and the same fun- damental structure.) 1. Orange G 2. Scarlet GN 3. Orange GGN 4. Sunset Yellow FCF 5. Red 2G 6. Red 10B 7. Victoria Violet 4BS 8. Ponceau MX 9. Ponceau 3R 10. Azogrenadine S 11. Red 6B 12. Crystal Ponceau 13. Carmoisine 14. Fast Red E 15. Benzyl Bordeaux B 16. Acid Bordeaux Solvent: 1% lithium chloride. 1,o 0,9 0,6 o,s 0,4 0,2 o,i MONO øo © o O ©©©(Do©© B C A B B B C C B B B B B B B C C Figure 4. Influence of the fundamental structure of the tested dyes on migration in mono- phasic neutral systems. (The sulfonation degree and the position of sulfo groups (if charac- teristic) remaining constant.) 1. Resorcine Yellow 11. Roccelline 21. Red 10B 2. Orange III 12. Orange G 22. Victoria Violet 4BS 3. Metanil Yellow 13. Crystal Ponceau 23. Ponceau MX 4. Orange IV 14. Acid Yellow G 24. Ponceau 3R 5. Orange RN 15. Scarlet GN 25. Azogrenadin S 6. Orange I 16. Orange GGN 26. Red 6B 7. Orange II 17. Sunset Yellow FCF 27. Benzyl Bordeaux B 8. Monosol Orange O 18. Carmoisine 28. Acid Bordeaux 9. Xylidine Orange 19. Fast Red E 29. Yellow 27.175N 10. Neptune Brown RX 20. Red 2G 30. Amaranth Solvent: 1% lithium chloride. 230