364 REPORT—1899, 
exposure’ thus marked off, periods 1, 2, 3 were equivalent to each other 
in fading power, whereas periods 4 and 5 were equivalent to four of the 
first period in this respect ; hence five patterns of each colour have been 
submitted respectively to an amount of fading equal to 1, 2, 3, 7, and 11 
times that of the first ‘fading period’ selected, viz. March 12 to April 
20, 1898. 
The dyed and faded patterns have been entered in pattern-card books 
in such a manner that they can be readily compared with each other. 
The following tables give the general result of the exposure experi- 
ments made during tie year 1898-9, the colours being divided, according 
to their behaviour towards light, into the following five classes: Very 
fugitive, fugitive, moderately fast, fast, very fast. 
The initial numbers refer to the order of the patterns in the pattern 
books. The 8S. and J. numbers refer to Schultz and Julius’s ‘ Tabel- 
larische Uebersicht der kiinstlichen organischen Farbstoffen’ (3rd edit. 
1897). 
VIOLET COLOURING MATTERS. 
Ciass I. Very Fueitive Cotours. (Wo0t.) 
Many of the colours of this class have faded so rapidly that at the end 
of the first ‘fading period’ (March 12 to April 20, 1898) only a very faint 
colour remains, and at the end of the fifth period (one year) all traces of 
the original colour have disappeared, the woollen cloth being either white 
or of a yellowish or greyish appearance. 
Triphenylmethane Colours. 
Wool Book XV. 
Acid Colours. 1. Red Violet 4RS. Sodium salt of dimethyl-rosaniline-trisul- 
phonic acid. §. and J.313. 
. Red Violet 5RS. Sodium salt of ethyl-rosaniline-trisulphonic 
acid, §. and J. 311. 
+ 19, Acid Violet4BN. Sodium salt of benzyl-penta-methyl-triamido- 
triphenyl-carbinol-sulphonic acid. 8. and J. 312. 
9 23. Acid Violet 6B. Acid sodium salt of tetraethyl-dibenzyl-p- 
rosaniline-disulphonic acid. §. and J. 317. 
x 24. Alkali Violet. Sodium salt of tetraethyl-monomethyl-phenyl- 
p-rosaniline-monosulphonic acid. S. and J. 318. 
. 27. Acid Violet 12B. Constitution not published. 
rs 30. Acid Violet 3B. Constitution not published. 
+ 31, Alkali Violet CA. Sodium salt of benzylated methyl-ethyl-p- 
rosaniline-mono-sulphonie acid. 
3 33. Acid Violet 2B. Constitution not published. 
a 35. Alkali Violet R. Constitution not published. 
Basic Colours. 5, Hofmann’s Violet. Monoethyl-rosaniline hydrochloride. §. and 
J. 302. 
is 10. Regina Violet. Diphenyl-rosaniline hydrochloride. §8. and J. 294. 
11. Regina Purple. Monophenyl-rosaniline-acetate. §. and J. 307. 
12. Ethyl Violet. Hexaethyl-p-rosaniline hydrochloride. §. and J. 
305. 
5 15. Methyl Violet 6BO. Pentamethyl-benzyl-p-rosaniline hydro- 
chloride. §. and J. 306. 
of 16. Crystal Violet. Hexamethyl-p-rosaniline hydrochloride. §. and 
J. 304. 
3 17. Violet 3B. Constitution not published. 
18, Methyl Violet B extra, Pentamethyl-p-rosaniline hydrochloride 
8. and J. 303, 
bo 
Safranine Colours. 
Basic Colours, 3. Giroflée. Dimethyl-xylyl-safranine chloride. §S. and J, 464, 
- 7. Rubramine. §, and J. 500. 
