1of
prepared sulphur (not exposed to the fire), one sicilicus of glass, likewise
one sÃcilicus of saltpetre, and a drachma of sal-ammoniac.21 The sulphur
is prepared as follows: it is first crushed to powder, then it is heated
for six hours in sharp vinegar, and finally poured into a vessel and washed
with warm water; then that which settles at the bottom of the vessel is
dried. To refine the salt it is placed in river water and boiled, and again
evaporated. The second compound contains one libra of sulphur (not exposed
to fire) and two librae of refined salt. The third compound is made from one
one sÃcilicus of saltpetre, and a drachma of sal-ammoniac.21 The sulphur
is prepared as follows: it is first crushed to powder, then it is heated
for six hours in sharp vinegar, and finally poured into a vessel and washed
with warm water; then that which settles at the bottom of the vessel is
dried. To refine the salt it is placed in river water and boiled, and again
evaporated. The second compound contains one libra of sulphur (not exposed
to fire) and two librae of refined salt. The third compound is made from one
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