ox THE ACTION OF LIGHT UPON DYED COLOURS. 289 



Natural Colouring Matters. 



Wool Book XIII. 



Blordant Colours *Ventilago (Cu) (Fe). Ventilago madraspatana (root-bark). 



„ (Sanderswood (Cu) (Fe). Pterocarpus santalinus (wood). 



„ Barwood (Cu) (Fe). Bapbia nitida (wood). 



„ Camwood (Cu) (Fe). 



Notes. — Diamine Brown M loses its reddish hue and becomes appa- 

 rently darker during the first ' fading period ' ; the altered colour fades 

 slowly, and linally leaves at the end of a year a pale drab colour. Azo 

 Acid Brown acquires a moi-e yellowish hue during the first ' fading period ' ; 

 the colour then fades very gradually without further change of hue, 

 leaving at the end of a year a veiy pale brown. It might fairly well be 

 classed as a ' fast colour.' Tlie Mikado Browns are by no means so fast to 

 light as the Mikado Oranges and Yellows : they experience the greatest 

 change in depth of colour during the first ' fading period ' ; the altered 

 colour, which is yellower than the original one, then fades very gradually, 

 <xnd leaves at the end of a year a fairly good buff colour. 



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 

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

 still leaves a pale shade. 



Azo Colours. 



Wool Book XII. 



Direct Cotton 5. Toluylene Brown G. From toluylene-diamine-sulphonic acid and 

 Colours. ?/i-pbenylene-diamine. S. and J. III. 241. 



,, C. Direct Cotton Brown K. From amido-nitroso-stilbene-disulpbonic 



acid and aniline. 



Natural Colouring Matters. 

 Wool Book XIII. 



Mordant Colours. 12. Cocbineal (Cr). Coccus cacti (insect). 



Class V. Very Fast Colours. (Wool.) 



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

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

 colour remains. 



Oxyhetone Coloiirs. 



Wool Book XIII. 



Jlordant Colours. Alizarin Bordeaux B (Cr) (Cu). Tetra-osy-anthraquinone 

 (1.2.5.8). Quinalizarin. S. and J. Ill 403. 

 Alizarin Bordeaux G (Cr) (Cu). 

 Alizarin Bordeaux GG (Cr) (Cu). 



Alizarin Maroon (Cr) (Cu). Amido-purpvrrin. S. and J. III. 394. 

 Alizarin Brown (Cr) (Fe). Diamido-alizarin. 



Anthracene Brown (Cr) (Fe). Tri-oxy-anthraquinone (1.2.3) 

 Anthragallol. S. and J. III. 396. 



1898. 



u 



