ON THE ACTION OF LIGHT UPON DYED COLOURS. 239 



Class I. Very Fugitive Colours. (Wool.) 



The colours of this class have faded so rapidly that at the end of the 

 first 'fading period' (June 8 to July 1, 1893) only a very faint colour 

 remains, or it has become very materially altered in hue. At the end of 

 the fifth period (one year) all traces of the original colour have disap- 

 peared, the woollen cloth being either quite white or merely of a yellowish 

 or brownish tint. 



Nitro Colours. 

 Wool Book III. 



Acid Yellows, 9. Aurantia. Ammonium salt of hexa-nitro-diphenylamine. S. and 

 J. 14. 

 „ 32. *Brilliant Yellow. Sodium salt of dinitro-o-naphthol-a-sulphonic 



acid. S. and J. 12. 

 „ .37. *Naphthol Yellow. Sodium salt of dinitro-o-naphthol. S. and 



J. 9. 

 „ 38. *Naphthol Yellow S. Sodium salt of dinitro-o-naphthol-;3-sul- 



phonic acid. S. and J. 11. 

 „ 43. Picric acid. Tri-nitro-f)henol. S. and J. 1. 



Azo Colours. 

 Wool Book IV. 



Mordant Colours. 14. *Wool Y'ellow (Cr.). From azo derivative of aniline and 



maclurin. S. and J. 32. 

 Wool Book III. 

 Basic Yellows. 4. Chrysoidine. From aniline and ?;(-phenylene-diamine. S. and 



J. 31. 

 Direct Cotton 1. Terra Cotta F. From primulin and «t-phenylene-diamine-azo- 

 Colours. naphthionic acid. 



„ 9 Direct Orange KR. Constitution not published. 



„ 26. Tliiazol Yellow. From azo derivative of dehydro-thio-toluidine- 



sulphonic acid, and dehydro-thio-toluidine-sulphonic acid. 

 S. and J. 98. 

 „ 28. Mimosa Yellow. From azo derivative of primulin, and ammonia. 



„ 30. Direct Yellow TS. Constitution not published. 



„ 36. Direct Orange R. Constitution not published. 



„ 3'J. Direct Yellow ASC. Constitution not published. 



Dijyhenylmetlian Colours. 



Basic Colours. 7. Auramine. Imido-tetra-methyl-diamido-diphenyl-methan-hydro- 

 chloride. S. and J. 260. 



Triplienylmethan Colours. 

 Acid Colours. 48. Uranin A. Sodium salt of fluorescein. S. and J. 315. 



Quinoline Colours. 

 Basic Colours. 42. Quinoline Yellow (sol. in spirit). Quino-phthalone. S. and J. 378. 



Acridine Colours. 



„ 1. Acridine Orange R. extra. Zinc salt of tetra-methyl-diamido- 



phenyl-acridine. 

 „ 2. Acridine Orange NO. Zinc salt of tetra-methyl-diamido-acridine. 



S. and J. 381. 

 ,, 3. Phosphine. Diaraido-phenyl-acridine-nitrate. S. and .1. 382. 



„ 6. Benzoflavine. Diamido-phenyldi-methyl-acridine hydrochloride. 



S. and J. 383. 



