409 
Tm . 
Is the calx or oxyd of tin intimately combined with sul- 
phur, in the proportion of 3 parts of tin to 2 of sulphur. 
Like Woolf, Proust found the process in which mercury 
or some of its combinations was employed, afforded the 
finest coloured aurum musivum. Thus from subliming 
equal parts of tin saturated with sulphur, and of corrosive 
sublimate, he obtained from 3 ounces of each, 2 1-2 oz. 
of very fine aurum musivum. 
It results from these accounts that for the finest aurum 
musivum one or other of the following processes are ex- 
pedient. 
Tin 12 parts, sulphu,r 7, sal-ammoniac 3, mercury 3, 
as indicated by Woolf. Or 
Equal parts of sulphurated tin and corrosive sublimate, 
ground together and sublimed ; though from the mer- 
cury coming over in part revived, I should almost sus- 
pect, that the corrosive sublimate might be still further 
diminished. 
For common aurum musivum, take the following pro- 
portions, viz. 
Sulphurated tin 6 parts : sal-ammoniac 4 parts : sul- 
phur 4 parts. 
The fire must not be greater than enough to sublime 
the sal-ammoniac : steady and moderate at first, and then 
heightened to a red heat, but not a full red heat. If the 
heat should not be enough, as may be seen on opening 
the crucible, it may be further applied. Aurum musi- 
vum is no longer used as a medicine, but only as a co- 
louring material in decorations. 
The observations of Woolf as to the superiority of the 
sublimed muriat of tin as a mordant, deserves to be 
noted ; for the dying of scarlet is becoming of conse- 
quence in this country. But it requires to be verified by 
experiment. 
