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50:19 ·
The sign for the saltpeter flower, a flower-like precipitation of saltpeter, e.g. on damp walls. The beautiful sign was used by the alchemists of the Middle Ages. |
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50:19 ·
The sign for the saltpeter flower, a flower-like precipitation of saltpeter, e.g. on damp walls. The beautiful sign was used by the alchemists of the Middle Ages. |
