270 EEPORT — 1895. 



Wool Book VIII. Primuline Yellow. From primuline and phenol. 



Wool Book VII. 



Acid Colour. 2. Metanil Orange 2. From »«-sulphanilic acid and j8-naphthol. 



S. and J. 77. 



Unclassified. 

 Wool Book VIII. 



Acid Colour. Xanthoproteic acid. Produced by the action of nitric acid on wool. 



NaUiral Colouring Matters. 

 Wool Book VIII. 

 Mordant Colours. Jack-wood (Cr.). Wood of Artocarpus integrifolia. 



„ Morinda-root (dyed without mordant). Root of Morinda citrifolia. 



Notes. — Benzo Orange R becomes yellower during fading ; at the end 

 of a year's exposure there remains an olive-yellow of medium intensity. 

 With aluminium and tin mordants the fastness is about the same as with 

 chromium. 



Toluylene Orange G and Cotton Yellow G, dyed as acid-colours, were 

 exposed last year and placed in this same class. The fastness of the 

 former is the same with chromium, aluminium, and tin mordants ; the 

 fastness of the latter is greatest with chromium. 



The comparative fastness of the colour given by Morinda-root without 

 the use of any mordant is somewhat interesting. 



The bright orange-yellow colour produced by the action of commercial 

 nitric acid on wool, now known as Xanthoproteic Acid, was at one time 

 supposed to be identical with Picric Acid. Apart from the very decided 

 ditference in shade of the two dyes, these exposure experiments confirm 

 most conclusively the present view that they are distinct colouring 

 matters. Picric Acid yellow rapidly changes from a pure lemon-yellow 

 to orange on exposure to light, whereas the orange-yellow colour due to 

 Xanthoproteic Acid undergoes no such change ; it merely becomes in the 

 early stages of fading a little duller and apparently slightly darker. Its 

 behaviour under the influence of light is very similar to that of such 

 colours as Curcumein and Azoflavin (reported upon last year), and may 

 possibly indicate that Xanthoproteic Acid belongs to the class of Nitro- 

 azo colours ; at present its constitution is entirely unknown. 



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. 



Azoxy Colotirs. 

 Wool Book VII. 



Direct Cotton 1. Chloramine Orange. Constitution not published. 

 Colours. 3. Diamine Orange D. Constitution not published. 



J, 4. Direct Orange 2E. Sodium salt of azo-stilbene-disulphonic acid. 



Azo Colours. 

 Wool Book VII. 



Direct Cotton 9. Cresotin Yellow R (Cr.). From o-tolidine and o-cresol-carboxjdic 

 Colours. acid. 



„ 10. Diamine Yellow N (Cr.). From ethoxy-benzidine, phenol, and 



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



