To make One's Self Invisible (Spell)

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

To make One's Self Invisible.

You must obtain the ear of a black cat, boil it in the milk of a black cow, then make a thumb cover of it and wear it on the thumb, and no one will be able to see you.

The grimoire Egyptian Secrets of Albertus Magnus lists this spell.

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