[ 656 ] 
fluid was tinged of this colour by a fmall one of the 
of wormwood, fix'd nitre, the lixivium 
faponarfum of the London pharmacopeia , precipi- 
tated a powder fimilar to the foregoing, except that 
its colour was lefs brilliant. 
3. Sal ammoniac likewife, one of the ingredients, 
to which the inenftruum ow’d its power of diifolving 
the platina at firft, precipitated great part of it in form 
of a fimilar powder. 
4. The liquors remaining after all thefe precipi- 
tations with faline fubftances, appear'd of a yellow 
colour, almoft as deep as before the precipitation. 
Fix’d and volatile alcalies being added alternately, 
the liquor flill continu’d yellow : But either of them, 
added after fal ammoniac had perform’d its office, 
threw down a freffi precipitate, which left the liquor 
colourlefs. 
5. The addition of tin likewife, after either of 
the falts feparately had throwm down all they were 
capable of doing, occafion’d a freffi and complete 
precipitation; provided a little more of the men- 
ftruum was dropt in, to enable the liquor to adt 
upon the metal. 
powder, 
2. S 
Experiment 7. 
As gold is totally precipitated by alcaline falts, but 
platina only in part ; and as a minute portion of pla- 
tina, remaining diffolv’d, tinges a furprifingly large 
quantity of the fluid of a yellow colour ; it was pre- 
fum’d, that a fmall admixture of platina with gold 
might by this means be readily difcoverable. 
A few 
