292 REPORT— 1898. 



Wool Book XIV. 



Basic Colours. *:l Diazine Black. From Safranine and phenol. 

 Direct Cotton o. Cenzo Black Blue G. From benzidine-disulphonic acid, with 

 Colours. o-naphthylamine-azo-a-naphthol-sulphonic acid N\V and 



a-naphthol-sulphonic acid NW. S. and J. III. 26G. 

 ,1 4. Benzo Black Blue K. From tolidine, witli a-naphthylamine- 



azo-o-naphthol-sulphonic acid NW and a-naphtliol-sulphonic- 

 acid NW. S. and J. III. 266. 



Benzo Black. Constitution not published. 



Eenzo Black S extra. Constitution not published. 



Diamond Jet Black 00. Constitution not published. 



Chicago Grey. Constitution not published. 



Diamine Jet Black SS. Constitution not published. 



Diamine Black HW. Constitution not published. 



Benzo Black Blue 5G. From benzidine-disulphonic acid, with 

 a-naphthylamine-azo-dioxynaphthalene-sulphonic acid S and 

 dioxynaphtbalene-sulphonic acid S. S. and J. III. 267. 



Diazo Brilliant Black B. From tolidino and a-naphthylamine- 

 sulphonic acid L ; developed with /3-naphthol. 



Diazo Brilliant Black R. Constitution not imblished. De- 

 veloped with ;3-naphthol. 



Clirome Black (Cr). Constitution not published. 



Diamond Black (Cr). From amido-salicylic-acid-azo-a-naphthyl- 

 amine and a-naphthol-sulphonic acid NW. S. and J. III. 159. 



Diamond Black NG (Cr). Constitution not published. 



Diamond Black GA (Cr). Constitution not pubhshed. 



Natural Colouring Matters. 



Mordant Colours. Logwood (Cr) (Fe*). Hamatoxylon catnpechianum (wood). 

 Cochineal (Fe*). Coccus cacti (insect). 



XoTES. — The colours dyed with the two Nigrisines are medium shades 

 of grey : they do not alter materially in hue during the fading process, 

 and at the end of the third period of exposure they still appear as pale 

 greys. The following colours alter very little in hue while fading, and 

 fade so gradually that they might fairly well be thought worthy of being 

 classed as ' Fast Colours : ' Nigrisine, Brilliant Black EB, Acid Black B, 

 Naphthol Blacks 3B and 6B, Victoria Blacks B, G, and 5G, Victoria 

 Black Blue. Diazine Black acquires a somewhat yellowish cast at the end 

 of the first period of exposure, ard then fades so slowly that even at the 

 end of a year a full grey shade remains. 



Several of the artificial black colours in this class are quite as 

 fast to light as the black obtained with logwood on chromium mordant ; 

 some indeed seem to be more permanent, and they do not acquire the 

 characteristic olive tint of the faded logwood and chromium black. 

 With iron mordant logwood gives a somewhat faster black than that 

 obtained with chromium ; the same appears to be the case with Chrome 

 .Black and the various marks of Diamond Black. 



Class IV. Fast Colours, (Wool.) 

 Azo Colours. 



Wool Book XIV. 



Mordant Colours. 5. Chrome Black (Fe). Constitution not published. 



» G. Diamond Black (Fe). From amido-salicylic acid-azo-a naph- 



thylamine and o-naphthol-sulphonic acid NW. S. and J. 

 III. 159. 

 ,, 7. Diamond Black NG (Fe). Constitution not published 



» 8. Diamond Black GA (Fe). Constitution cot published. 



