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It is made of burnt Alum, or of red Precipitate, or Arcanum Corallinum levigated, according as the occasion may require. Take Alum, as much as you please, put it into a new earthen Pot, and burn it so long, till the whole quantity ceases bubbling or swel∣ling, or will become no longer frothy; then being cold, keep is for use.
They are of use externally, for eating away of proud Flesh;
and are good in malign Ulcers, whether Venereal, or others.