THE 
EMPORIUM 
OP 
ARTS AND SCIENCES* 
Yol* S.] April, 1843. [No. !£<> 
NO. 79* 
Researches respecting the Composition of Enamel* By 
C. Clouet, Associate of the French National Instil 
tute * 
(Concluded from page 400.) 
A Yellow may be obtained also directly from silver*, 
All these mixtures may be varied, and you may try 
others. For this purpose you may use sulphat of silver^ 
or any oxyd of that metal mixed with alumine or silex^ 
or even with both, in equal quantities* The whole ihusf; 
be gently heated until the yellow colour appear, and the 
matter is to be employed with the fluxes pointed out for 
yellows* Yellow of silver, like purple, cannot endure a 
strong heat i a nitric solution of silver may be preciph 
tated by the ammoniacal phosphat of soda, and you will 
Obtain a yellow precipitate, which may be used to paint 
in that colour with fluxes, which ought then to be a little 
harder. 
Besides the methods above mentioned, the best man- 
ner of employing the oxyd of silver is, in my opinion, to 
employ it pure : in that case, you do not paint, but stain , 
It will be sufficient, then, to lay a light coating on the 
Yol. it, 3 D 
