found in tie Red Lead of Siberia. 283 



Colour, which difappear at the end of fome time, if an ex- 

 cefs of muriatic acid has been added, and the liquor 

 aflumes a brownifh colour. 



B, Treated in the fame manner, becomes at fTrft yellow- 

 ifh-hrown, and afterwards aflumes a beautiful green colour. 



A, Mixed with a folution of hydro-fulfure of potafh, givej 

 no precipitate, but by the addition of fome drops of the 

 nitric acid there is immediately formed a precipitate of 91 

 chefnut-brown colour. 



V>, Mixed with the fame reagent, gives, without the ad- 

 dition of the nitric acid, a green precipitate, which, by 

 that acid, becomes yellowifh. 



A, With a folution of the nitrate of lead, forms a white 

 precipitate, foluble in the nitric acid. 



B, Mixed with the fame folution, gives an orange pre- 

 cipitate, abfolutely of the fame fhade as that of the red 

 lead pulveiifed. 



A, Mixed with a little alcohol and nitric acid, does not 

 change its colour. 



B, Added to the fame reagent, immediately aflumes a 

 blueifh green colour, which preferves the fame fhade even 

 after deficcation :. ether alone gives it the fame colour. 



A, With a folution of the nitrate of mercury, gives a 

 white flaky precipitate. 



B, With the fame folution of mercury, gives a precipi- 

 tate of a dark cinnabar colour, 



A, With a folution of the nitrate of filver, forms * 

 white flaky precipitate. 



B, With the fame reagent, gives a precipitate, which, 

 the moment it is formed, appears of a mod beautiful car- 

 mine colour, but becomes purple by expofure to the light. 

 This combination, expofed to the heat of the blow-pipe, 

 melts before the charcoal is inflamed. It aflumes a blackifh 

 and metallic appearance. If it be then pulverifed, the pow- 

 der is (till purple; but after the blue flame of the lamp is 

 Wrought in contact with this matter, it aflumes a gre-en co- 

 lour, 



