1libra of sulphur (not exposed to the fire),
half a líbra of
refined salt, a quarter of
a líbra of sal-ammoniac, and one uncía of red-lead. The fourth compound
consists of one líbra each of refined salt, sulphur (not exposed to the fire) and
argol, and half a libra of chrysocolla which the Moors call borax. The fifth
compound has equal proportions of sulphur (not exposed to the fire), sal
ammoniac, saltpetre, and verdigris.
a líbra of sal-ammoniac, and one uncía of red-lead. The fourth compound
consists of one líbra each of refined salt, sulphur (not exposed to the fire) and
argol, and half a libra of chrysocolla which the Moors call borax. The fifth
compound has equal proportions of sulphur (not exposed to the fire), sal
ammoniac, saltpetre, and verdigris.
The silver which contains some portion of gold is first melted with
lead in an earthen crucible, and they are heated together until the silver
exhales the lead. If there was a libra of silver, there must be six drachmae of
lead. Then the silver is sprinkled with two uncíae of that powdered com-
lead in an earthen crucible, and they are heated together until the silver
exhales the lead. If there was a libra of silver, there must be six drachmae of
lead. Then the silver is sprinkled with two uncíae of that powdered com-
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digilib