May 19, 2015
The Canadian Department of Environment and the Department of Health has announced their final decision after screening assessments of 61 azo direct dyes and eight azo reactive dyes, and 6 azo metal complexes and other azo substances. Details on the four azo metal complexes and two additional azo substances are provided below:
| Chemical | CAS No. |
| 1-Triazene, 1-(4-nitro-1-naphthalenyl)-3-[4-(phenylazo)phenyl]- | 6708-61-8 |
| Benzenediazonium, 4-[(2,6-dichloro-4-nitrophenyl)azo]-2,5-dimethoxy-, (T-4)-tetrachlorozincate(2-) (2:1) | 63224-47-5 |
| Spiro[isobenzofuran-1(3H),9′(8′aH)-xanthylium], 3′,6′-bis(diethylamino)-3-oxo-, chloride, compd. with [4-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H- | 72391-06-1 |
| Benzenesulfonamide, 4-[[4-[[4-(2-hydroxybutoxy)-3-methylphenyl]azo]phenyl]amino]-3-nitro-N-(phenylsulfonyl)-, monolithium salt | 83221-38-9 |
| Amines, C10–14-branched and linear alkyl, bis[2,4-dihydro-4-[(2-hydroxy-4-nitrophenyl)azo]-5-methyl-2-phenyl-3H-pyrazol-3-onato(2-)]chromate(1-) | 85029-57-8 |
| Xanthylium, 9-[2-(ethoxycarbonyl)phenyl]-3,6-bis(ethylamino)-2,7-dimethyl-, hydroxy[2-hydroxy-5-nitro-3-[[2-oxo-1-[(phenylamino)carbonyl]propyl]azo] benzenesulfonato(3-)]chromate(1-) | 94276-35-4 |
They have concluded that no further action on the substances since they do not meet any of the criteria under section 64 of the Canadian Environmental Protection Act, 1999.