M. C, Lea on Colored Derivatives of Naphthaline. 299 
The wood spirit before use should be distilled with one-third 
of its bulk of very strong (almost saturated) solution of caustic 
T a, to decompose any acetate of methyl which may be present. 
his Operation must be performed over the water bath, 
Philadelphia, Nov., 1862. 
SS 
ArT. XXIV.—Cblored Derivatives of Naphthaline; by 
M. Carey Lua, Philadelphia. 
IN the course of a variety of experiments on the effects of re- 
ducing agents upon dinitronaphthaline undertaken some time 
Since, [ made some observations which appeared to me to be of 
interest. But not having access to the publications of several 
jwemiats engaged in the same direction, I could not ascertain 
W far they were new. i ; 
T now find by the able résumé of M. Emile Kopp in the Rep. 
a Chemie Appliquée, th 
e 
tremely minute 
be 
oy of dinitronaphthaline be added, and wo one 
Ved a few moments, a clear solution 18 etere sa eb . 
Bes large quantity of water, the dingy blue changes to a mag- 
hificent arple, of areas depth and richness. If pieces of woolen 
oe dipped for an instant into the blue Jiquid, they 
tg out bluish black—if they are then washed with plenty of 
ater they exhibit a similar change, and assume a full, nic ead 
Ple shade: This color is brightened by soap and hot water, an 
