It is a yellow protoxide of lead, which has been melted and left to
crystallize by cooling. It is only employed in pharmacy for forming
other preparations of lead, and the following officinal plasters,
_Emplast._ _Plumbi_, L. E.D. _Ceratum Saponis_. L. It is added to wines
to remove their acidity; for the detection of which, evaporate the
suspected liquor to a thick fluid, add charcoal, and calcine in a
crucible: in the space of an hour metallic points will be obtained,
consisting of lead surrounded by a quantity of yellow protoxide.