ON TPIE ACTION OF LIGHT UPON DYED COLOURS. 



267 



Acid Colours. 



9. 



10. 



11. 

 15. 

 16. 

 19. 



Direct Cotton 

 Colours. 



17. 

 23. 



25. 



36. 



39. 

 40. 



iS. 



Ponceau lORB, Constitution not published. 



Fast Wool Ked. From naphthionic acid and )3-naphthol-disul- 



plionic acid. 

 Azo Bordeaux. Constitution not published. 

 Antliracene Ked. Constitution not published. 

 Azo Cochineal. Constitution not published. 

 Milling Scarlet. From di-7M-amido-azoxytoluene, o-naphthol- 



mono-sulphonic acid, and /3-naphthol-disulphomc acid R. 

 Erica B. From dehydro-thio-wi-sylidine and a-naphthol-e-disul- 



phonic acid. S. and J. 69. 

 Geranine BB. Constitution not published. 

 Erica G. Constitution not published. 

 Geranine G. Constitution not published. 

 Brilliant Congo R. From tolidine, j8-naphthylamine-mono- 



sulphonic acid Br, and j3-naphthylamine-disulphonic acid R. 



S. and J. 193. 

 Brilliant Purpurin R. From o-tolidine, ;3-naphthylamine-disul- 



phonic acid R and naphthionic acid. S. and J. 201. 

 St. Denis Red. From diamido-azoxj'-toluene and a-naphthol- 



mono-sulphonic acid NW. 

 Dianthine 4B. Constitution not published. 

 Diamine Scarlet B. From benzidine, j8-naphthol-disulphonic acid 



G, and phenol (ethylated). S. and J. 169. 

 Brilliant Congo G. From benzidine, )3-naphthylamine-mono-sul- 



phonic acid j8 and ;8-naphthylamine-disulphonic acid R. S. 



and J 165. 



Oxyketone Colour. 

 Mordant Colour. 4. Alizarin Maroon (Al.) (Sn.). Amido-alizarin. 



Mordant Colour. 



Natural Colouring Matter. 

 4. Cochineal (Al.). The insect Coccus cacti. 



Note. — The more fugitive character of Alizarin Maroon as compared 

 with Alizarin shows that the introduction of the amido group (N H2) into 

 the alizarin molecule reduces considerably its power of giving fast colours. 



Class IV. Fast Colours. (Wool.) 



The colours of this class show comparatively little fading during the 

 first, second, and third periods. At the end of the fourth period of ex- 

 posure a pale shade remains, which at the end of the year's exposure still 

 leaves a pale tint. 



Azo Colours. 

 Wool Book V. 



Acid Colours. 3. Azo Acid Magenta B. From toluidine and dioxy-naphthalene-o- 

 mono-sulphonic acid (1 : 8). S. and J. 228. 

 J, 5. Azo Acid Magenta G. From sulphanilic acid and diosy-naphtha- 



lene-a-mono-sulphonic acid (1 : 8). S. and J. 229. 



Wool Book V. 

 Acid Colour. 



Triphenylmethan Colour. 



2. Violamine A2R. Sodium salt of di-o-tolyl-rhodamine-disulphonic 

 acid. 



Oxyketone Colour. 

 Wool Book VI. 

 Mordant Colour. 8. Purpurin (Al.) Tri-oxy-anthraquinone (1:2: 4). 



