the Carinihian Molybdate of Lead. 297 
when it was dissolved in distilled water, and was saturated 
with an acid, prussiate of pot-ash produced a brown cloud. 
§ VII. Molybdate of Lead sublimed with Muriate of Ammoniac. 
EXPERIMENT I. 
A mixture of 50 grains of the molybdate of lead and 240 
grains of muriate of ammoniac was sublimed. 
The sublimate was partly yellow, green, and blue ; there 
was also some muriatic acid, and the residuum was a black 
powder.* 
A. The sublimate was mixed with an equal weight of 
sulphur, and distilled. 
The residuum of this was a black powder, resembling the 
mineral called molybdaena, and when distilled with nitric acid, 
afforded a citron-coloured oxyde. 
B. A quantity of distilled water was boiled on the resi- 
duum of the first sublimation, by which a part was dissolved, 
and communicated a blue colour to the water. 
1 . Prussiate of pot-ash added to some of this blue liquor, 
produced a prepipitate of Prussian blue. 
2. Sulphuric acid added to another portion deepened the 
blue colour. 
3. Lixivium of carbonate of soda precipitated some ochry 
matter. 
4. And nitrate of silver was decomposed, and muriate of 
silver was precipitated. 
# M. Sage has observed, that molybdaena with ^muriate of ammoniac affords a 
blue sublimate. Jourrt. de Physique, 1788, p. 389. 
