ON THE ACTION OF LIGHT UPON DYED COLOURS. 349 
Azo Colours. 
Wool Book X. 
Direct Cotton 1. Diamine Sky Blue. From diphenitidine and amido-naphthol- 
Colours. disulphonic acid H. 
5 2. Chicago Blue 6B. Constitution not published, 
FS 3. Brilliant Benzo Blue 6B. Constitution not published. 
. 8. Diamine Blue 6G. Constitution-not published. 
Nores.—Certain colours in this class—e.g. Gentianine, &c.—fade 
during the first period to a grey colour possessing a moderate degree of 
fastness. Neutral Blue is characterised by fading toa dull reddish colour. 
Gallanilic Indigo PS and Diamine Blue 6G, when completely faded, 
leave the wool of a pronounced yellowish tint. 
Crass IJ, Fuaitive Contours. (Woot.) 
The colours of this class show very marked fading at the end of the 
second ‘fading period’ (August 12 to September 3, 1895), and after a year’s 
exposure they have entirely faded, or only a tint remains. 
Triphenylmethane Colours. 
Wool Book IX. 
Basic Colours. 1. Turquoise Blue. Constitution not published. 
is 2. Turquoise Blue 2B. Constitution not published. 
5 6. Glacier Blue. Zinc double chloride of dichlor-dimethyl-diamido- 
ditolyl-phenyl-carbinol. 
Acid Colours. 5. Cyanol extra. Sodium salt of m-oxy-diethy]-diamido-phenyl- 
ditolyl-carbinol-disulphonic acid. 
Thiazine Colours. 
as 10. Thiocarmine. Sodium salt of diethyl-dibenzyl-thionine-disulphonic 
acid. 
Oxazine Colours. 
Basic Colours. 27. Muscarin J. Dimethyl-phenyl-p-ammonium-f-oxy-naphthoxazine. 
8. and J. 343. 
= 28. Metamine Blue B. Dimethy]-phenyl-p-ammonium-8-naphthoxa- 
zine. §. and J. 342. 
5 29. New Fast Blue H. Constitution not published. 
8 30. New Fast Blue F. Constitution not published. 
Acid Colour. 27. Azine Blue. Constitution not published. 
Safranine and Induline Colours. 
Basic Colours. 15. Basle Blue B. Dimethyl-amido-tolyl-amido-tolyl-pheno-naphtha- 
zonium chloride. 
Fe 16. Diphene Blue R. An induline colour. 
3 17. Indazine M. Tetra-methyl-diamido-diphenazine-phenyl-chloride. 
8. and J. 364. ' 
a 26. Metaphenylene Blue B. Tetra-methyl-di-o-tolyl-diphenazonium 
chloride. 
Natural Colouring Matters. 
Acid Colours. 1. Indigo Carmine. Sodium salt of indigotin-disulphonic acid. 
5 2, Indigo Purple. Sodium salt of indigotin-mono-sulphonic acid. 
Azo Colours. 
Wool Book X. 
Direct Cotton 9. Benzo Cyanine 3B. Constitution not published. 
Colours. 11. Indoin Blue 2B. From Safranine and 8-naphthol, 
