COAL-TAR COLOURS IN GENERAL

The method may be applied to objects fixed with osmic
acid, and (still better) osmium-chromic acid (Flesch's
formula, No. 13).
138. Griesbach's Experiments.x-Griesbach     examined in
respect of their applicability to histological technic the
colours mentioned in the following list. They were most of
them obtained from Herrn Dr E. N6lting, Director of the
School of Dyeing at Mulhouse (Chemieschule fir chemische
Farbenindustrie).
The colouring matters in question are mostly deep-hued,
representing all shades of yellow, orange, and red. The
shades are distinguished by the capital letters-Y (yellow),
0 (orange), R (red), 00, RR, &c.
Anilins studied by Griesbach.2

Commercial name.
1. Anilin yellow
(Anilingelb)
2. Saiiregelb or
Echtgelb
3. Chrysoidin
4. Vesuvin (Phen-
ylenbraun,
Bismarckbraun,
Manchester-
braun)
5 Tropaeolin Y.

Chemical name.
Amidobenzol
Amidonzobenzol-
sulfoshiure
Diamidoazo-
benzol
Triamidoazo-
benzol
Phenolazoben-
zolsulfosaures
Natrium

Obtained from-
Any large manu-
factory
Ibid.
Williams, Thomas,
and Dower, Brent-
ford and Fulham,
near London, or
as No. 1
Dr. E. ter Meer
and Comp. chem.
Farbenlabr. Uer-
dingen a. Rh.
Durand and
Hugenin, Basel

Literature.

Jahresber.d.prakt.
Chem., 1861, 82,
462.
Chem. Industr.,
1879, 49, 346.
A. W. Hoffman,
Berl. Ber., 1877,10,
213; N. 0. Witt,
ibid., 1877, 10, 550,
6b4; Griess, ibid.,
1877, 10, 388.
Ztsch. f. Ch., 1867,
N.F., 3, 278.
Per d. d. Chern.
Ges., 1879, 259.

I ' Arch. Mik. Anat.,' xxii, p. 132.

11

III

2  I bi d., p. 1341.