370 REPORT—1899. 
Black and Grey Colours. 
Ver ott Moder- Vv 
fugitive | sitive |ately fast ae | fast 
wy ee eee pea 
Azo colours . 6 > - ° 3 20 36 4 = 
Oxyketone colours A . . = == — 4 1 
Oxazime colours . : . . — 1 | Bia lee ame 
Safranine colours A p : — Z| 2 Thy peal iene 
Induline colours . : c —_ — | 6 1 ps 
Natural colours . : 5 : = 1 | 3 Hi ts 
Rgtil< Sl sar eR ere 3 24 | 50 10 | 1 
GENERAL TABLE. 
(Including all the colowrs in the above tables.) 
| | > | 
| Ver +: | Moder- ; , 
| sagitive | Pasitive |ataty = Fest | ea, | 
Nitro colours 4 “ 5 — — 1 site 
Hydrazone colours , é ik — _ 2 = 
Azoxy colours : : A . 1 — 3 3 10. «| 
Azocolours . : 5 j 3 APR Ty alval 166 65 22 
Triphenylmethane colours . Boy ee Bla) fe 6 iin 
Pyronine colours . ‘ 20 | 5 = —_ 1 
Acridine colours . F 5 A etl 1 _ = ate 
Quinoneoxime colours . = —_ —_ % 6 
Oxyketone colours = a 2 1 53 
Oxazime colours . 8 6 6 = Dy) 
Thiazime colours . 5 1 = Lj 2 
Safranine colours 12 8 3 3 = 
Induline colours 2 — 24 = = 
Thiobenzenyl colours 3 — | — ae oe 
Quinolin colours : , 1 Ye = = 
Chromogen . i - A ‘ => _ — — 1 
Prussian blue . . . — f= = = 1 
Natural colours 3 / 40 17 5 42 
Total . F : * ah ule! | BASE) yh ~ BG me MRS 140 
The above tables show clearly that, although the coal-tar dyestuffs in- 
clude a very large number which yield fugitive colours, there are also 
many which yield fast colours. It is seen that both these classes are also 
represented among the natural or vegetable dyestuffs, and the prevalent 
idea that the latter are fast while the former are fugitive is merely a 
popular error. This opinion has, however, been so long fixed in the 
popular mind that it is to be hoped the conclusive proof of its fallacy 
afforded by these experiments will cause it to be finally abandoned. 
These tables, indeed, show that coal-tar furnishes the dyer with a larger 
number of colours fast to light than are derived from any other source. 
The work of the Committee being now limited to the examination of 
dyes on the cotton fibre, as well as new colouring matters introduced each 
year, the Secretary will continue the investigation without requiring any 
grant in aid, and a reappointment of the Committee is not necessary. 
