268 REPORT— 1895. 



Natural Colouring Matters. 

 Wool Book VI. 



Mordant Colours. .S. Lac-dye (AL). The insect Coccus ilicis. 

 „ 9. Munjeet (AL). Root of Rubia cordifolia. 



Notes. — The fastness of Violamine is worthy of special note, since 

 this dyestuff belongs to the Triphenylmethan colours, a group which 

 usually only furnishes fugitive dyes. Violamine is considerably faster 

 than the closely allied Rhodamine, which has been classed as a ' fugitive ' 

 colour (see Report, 1892-93). 



Class V. Very Fast Colours. (Wool.) 



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

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

 remains. 



Wool Book V. Azo Colour. 



Direct Cotton 16. Diamine Fast Red F. From benzidine, amido-naphthol-sulphonic 

 ■ Colour. acid G and salicylic acid. S. and J. 1 79. 



„,,. , _ , ,,T Oxyketone Colours. 



Wool Book VI. ^ 



Mordant Colours. 1. Alizarin Bordeaux B (Al.) (Sn.). Tetra-oxy-anthraquinone 



(1:2:5:8). 



2. Alizarin Bordeaux G (Al.) (Sn.). 



3. Alizarin Bordeaux GG (Al.) (Sn.). 

 6. Alizarin (Al.). Di-oxy-anthraquinone (1 : 2). 



6. Anthrapurpurin (Al.). Tri-oxy-anthraquinone (1:2: 7). 



7. Flavopurpurin (AL). Tri-oxy-anthraquinone (1:2: 6). 

 Nitro-alizarin (Zn.). 



,„ , „ , ,,^ Natural Colouring Matters. 



^\ ool Book \ I. "^ 



JUordant Colours. 10. Chay-root (AL). Root of Oldenlandia umbellata. 



„ 11. Morinda-root (Al.) (Sn.). Root of Morinda citrifolia. 



„ 12. Mang-kudu (Al.) (Sn.). Root of Morinda umbellata. 



„ 7. Lac-dye (Sn.). 



,, 8. Cochineal (Sn.). 



Notes. — This class includes several colours of the alizarin group, so 

 -well known for their general fastness to light, washing, milling, &c. The 

 superior fastness of the red given by Chay-root, as compared with that 

 obtained from Madder, is no doubt due to the absence of Purpurin in the 

 former. 



The colours given by Lac-dye and Cochineal with tin mordant are dis- 

 tinctly faster than those with alumina. 



Most noteworthy is the remarkable fastness of Diamine Fast Red, 

 since it belongs to the so-called ' Congo Colours,' a group which, as already 

 stated, usually supplies only such red dyes as possess at most a moderate 

 fastness to light. 



ORANGE AND YELLOW COLOURING MATTERS. 



Class I. Very Fugitive Colours. (Wool.) 



Azo Colour. 



Wool Book VIII. 



Developed Colour. Primuline Orange. From primuline and resorcinol. 



