242 REPORT— 1894. 



Wool Book III. 



Acid Colours. 28. *Curcumein. Nitro derivative of Diphenylamine Orange. S. 

 and J. 101. 

 „ 29. *Azoflavin S. Same as Curcume'in, but more highly nitrated. 



S. and J. 102. 



„ 44. * Bromine derivative of Metanil Yellow. 



„ 45. Persian Yellow (G). Constitution not published. 



Direct Cotton 2. Salmon Ked. Constitution not published. 



Colours. 3. Congo Orange R. From tolidine, /S-naphthylamine-disulphonic 

 acid R and phenol (ethylated). S. and J. 202. 

 „ 7. Congo Orange G. From benzidine, ;3-naphthylamine-disulphonic 



acid R and phenol (ethylated). 

 „ 10. To'uylene Orange G. From tolidine, o-cresotinic acid, and 



■w.-toluylene-diamine-sulphonic acid. S. and J. 196. 

 ,, 23. Carbazol Yellow. From diamido - carbazol and salicylic acid. 



S. and .J. 181. 

 ,, 24. *C'otton Yellow G. Sodium salt of diamido-diphenyl-urea-disazo- 



salicylic acid. S. and J. 144. 

 Wool Book IV. 

 Mordant Colour. 2i. Mordant Yellow (Cr.). Constitution not published. 



Triphenylmethan Colours. 

 Wool Book III. 



Acid Colours. 33. Aurotin. Sodium salt of tetra-nitro-phenol-phthale'in. S. and 

 J. 314. 



Natural Colourinc/ Matters. 

 Wool Book IV. 

 Mordant Colours. 5. Weld (Al.). Reseda luteola (whole plant). 



Notes. — The following colours become somewhat duller and apparently- 

 darker during the first and second periods of exposure : — Diphenylamine 

 Orange, Metanil Yellow, Fast Yellow N, Azo-flavin S, Acid Yellow 00, 

 and Aurotin. This appearance is only observed when the patterns are 

 examined ' underhand,' i.e. by looking down into the fabric ; when they 

 are examined ' overhand,' i.e. by glancing along the surface, a normal 

 fading of the colours is observed. This darkening is probably due to the 

 presence of the diphenylamine group in the first four colours mentioned, 

 and to the presence of the nitro group in the case of Aurotin, of which 

 the alteration in hue reminds one of the change occurring in Picric Acid 

 Yellow, though it is less pronounced. 



Mordant Yellow with aluminium and tin mordants gives colours which 

 may well be classed with the 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. 



Nitro Colours. 

 Wool Book III. 



Acid Colours. 3. *Palatine Orange. Ammonium salt of tetra-nitro - y - diphenol. 

 S. and J. 8. 



Hydrazone Colours. 



Acid Colours. 36. Tartrazin. Sodium salt of diphenyl-^-sulphonic-acid-osazone- 

 dioxytartaric acid. S. and J. 19. 

 39. Nitrazin Yellow. Sodium salt of dinitro-dixylyl-j;-sulphonic 

 acid-osazone-dioxytartaric acid. 



