Technical Chemistry. 273 
orated to dryness, leaves the coloring matter as a brittle mass, having a 
remarkably beautiful golden-green metallic reflection. By transmitted 
light it has a red color. Mr. Béchamp has analyzed carefully-prepared 
specimens of fuchsine, and found it to have the formula C,,H,,N,0. 
This hydrochlorate he found to contain an amount of hydrochloric acid, 
corresponding with the formula C,,H,2N,9, . He also examined 
the hydrochloroplatinate, which is a purple precipitate; it has the form- 
The existence of oxygen in this base is 
C,2H,2N,0 = ©,,H, Ng + H,0 
—~ wav ——o~ 
Béchamp’s fuchsine. | Anhydrous fuchsine. | Water. 
This is, perhaps, to some extent, confirmed by an experiment I made 
With iodaniline. I find that iodaniline, when heated, yields fuchsine. 
This change can only be expressed thus :— 
2(C,[H.IJN) = C,2H,N2 + 2HI 
— Neila emerson 
Todaniline. Anhydrous fuchsine. 
7 2s 
hydrate, it is remarkable that its hydrochlorate, and, more particularly, 
sy hydrochlorplatinate, should also be hydrates. But, as 
Some time back, | had upwards of 100 gallons of a hot, aqueous 
Solution of this coloring matter, which had been prepared by means of 
nitrate of mercury. This solution, on standing until cold, deposited a 
ane he oxygen of the a I 3 
Sriginal color, If an slonkale solution of fuchsine be left in contact 
until 
osphere, sever 
Like aniline Pe 
matter. Tanni ipitates | 
iffcultly soluble substances, Bichlorid of 
di 
7 It is on account of the presence 
commercial fuchsine possess a scarlet character of color. 
Amu. Jour, Sci.—Szo OND SERIES, Vou. XXXII, No. 95,—SEPT., 1861. 
35 
