A good Black Plaster (Spell)

From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:

A good Black Plaster.

Take one-half pound of olive oil, a quarter of a pound of silver litherage, a quart of good vinegar; rose vinegar would be the best for the purpose. Stir all these articles together in a pan placed upon the fire till the mass becomes black. Then pour it into pure water, and grind it upon a stone or board together. It is a good remedy for all sorts of injuries.

The grimoire Egyptian Secrets of Albertus Magnus lists this spell.

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