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41b:39 ·
This is the sign for realgar, a compound of sulphur and arsenic, a ruby-red paste used in the production of glass, small shot, signal lights, grounding paint for ships' hulls, etc. It was a substance that the alchemists worked continuously with during the Middle Ages. Note that sulphur could be drawn  and arsenic  , two signs which have been combined in this.
Realgar was also drawn   ,  , and  .
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