67 
Coppefo 
4th, I saturated distilled acetous acid with oxygenated 
muriatic acid gas. This acid, digested cold on the copper, 
dissolved it in part ; but it formed a beautiful micaceous 
scaly white, which had no relation with the acetat. Cop- 
per exposed to the vapour of this acetous acid, saturated 
with oxygenated muriatic acid gas, becomes covered with 
very brilliant small crystals of a bright-blue colour, some 
of which are transparent and white. These crystals pre- 
sented long square pyramids, effloresced in the air, and. 
had none of the characters of the acetat of copper. 
5th, The acetous acid, distilled several times on the 
ox yd of manganese, attacks copper and dissolves it, but 
too weakly and in too small quantity for me to recom- 
mend this method. 
6th, The acetite of lead poured upon a solution of the 
sulphat of copper immediately produces a decomposition 
from which there results sulphat of lead, which precipi- 
tates itself in a little time ; and acetat of copper, which re- 
remains in solution. By decanting the latter, and eva- 
porating it to a pellicle in a copper kettle, you will ob- 
tain beautiful crystals of Venus. If you wash well the 
sulphat of lead, and prepare it to be employed in paint- 
ing, as white lead, this last process may become very ad- 
vantageous. 
Crystallized verdigris is in great request for painting 
and varnishing, to which it supplies lively and durable 
colours. Chemists obtain from it by distillation that acid, 
the smell of which is very penetrating, called radical vine- 
gar> and also acetite acid . — 4 Philos . Mag. 17 1, 
Preparation oj acetic acid or radical vinegar . This 
used to be prepared in large quantities for sale, as an an- 
tiseptic, and aromatic, as well as a cephalic medicine, (to 
be smelt at) by Mr, Henry, father to Dr. William Henry ? 
of Manchester, I do not know, therefore, that any bet? 
