ON THE ACTION OF LIGHT UPON DYED COLOURS. 243 



Azo Colours. 

 Wool Book III. 



Acid Colours. 23. *Acid Yellow. Sodium salt of amido-azo-benzene-disulphonic 

 acid. S. and J. 21. 

 „ 24. *Fast Yellow. Sodium salt of amido-azo-toluene-disulphonic acid. 



S. and J. 22. 

 „ 25. Brilliant Yellow S. Sulphonated Diphenylamine Orange. S. and 



J. 76. 

 31. *Milling Yellow 00. Constitution not published. 

 „ 34. *Milling Yellow. From /3-naphthylamine-a-sulphonic acid and 



salicylic acid. 

 Direct Cotton 11. Titan Yellow R. From thio-^-toluidine-sulphonic acid. (Con- 

 Colours, stitution not published.) 



„ 12. Chrysamin R. From o-tolidine and salicylic acid. S. and J. 195. 



„ 13. Cresotin Yellow E. From «-tolidine and «-cresol-carboxylic acid. 



„ 16. Chrysophenin. Ethjiated Brilliant Yellow from diamido-stilbene- 



disulphonic acid. S. and J. 156. 

 ,, 17. Cresotin Yellow G. From benzidine and o-cresol-carboxylic acid. 



„ 19. Diamine Yellow N. From ethoxy-benzidine, phenol, and salicylic 



acid (ethylated). S. and J. 204. 

 „ 21. Chrysamin G. From benzidine and salicylic acid. S. and J. 166. 



„ 22. *Oriol Yellow. From dehydro-thio-/;-toluidine-snlphonic acid and 



salicylic acid. S. and J. 99. 

 „ 38. Titan Yellow Y. From thio-7;-toluidine-sulphonic acid. (Con- 



stitution not published.) 

 Wool Book IV. 

 Mordant Colours. 12. Chrome Orange (Cr.). Constitution not published. 



„ 13. Yellow for wool A F (Cr.). Constitution not published. 



„ 20. Chrome Yellow (Cr.). Constitution not published. 



Oxyketone Colours. 



Mordant Colours. 25. Galioflavin (Cr.). Oxidation product of gallic acid. S. and J. 

 242. 

 „ 26. Alizarin Yellow A (Cr.). Tri-oxy-benzophenone. S. and J. 237. 



Natural Colouring Matters. 



Mordant Colours. 2. Persian Berries (Cr.). 

 8. Weld (Sn.). 



Notes. — In Palatine Orange we meet with the fir.st example of a colour 

 fast to light, the manufacture of which has already been abandoned ; 

 possibly some difficulty or e.xpense connected with its manufacture may 

 account for this circumstance. 



Yellow for wool AF, applied with aluminium mordant, is very fugi- 

 tive, while Chrome Orange seems quite as fast as with chromium. Chrome 

 Yellow with aluminium mordant may be classed as a ' moderately ^fast ' 

 colour. 



Galioflavin with aluminium and tin mordants gives fugitive colours, 

 more especially with aluminium. 



Class V. Very Fast Colours. 



The colours of this class show a very gradual fading during the dif- 

 ferent periods, and even after a year's exposure a moderately good colour 

 remains. 



B 2 



