Symbol 42:22
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42:22 ·
A sign in alchemy for nitric acid. This acid was also drawn 
and 
.
Compare with 
for hydrochloric
acid.
The prefix 
was commonly used to indicate an
acid. One added it, for example, to the sign for
sulphur, 
, which gave the sign for
sulphuric acid, 
. The sign 
is an old one in alchemy for fire, and
symbolized the etching and burning qualities of acids.