The difference between Black magic and Gray magic
When used as nouns, black magic means magic derived from evil forces, as distinct from good or benign forces, whereas gray magic means any magic which transcends or blends white magic and black magic.
check bellow for the other definitions of Black magic and Gray magic
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Black magic as a noun (idiomatic):
Magic derived from evil forces, as distinct from good or benign forces; or magic performed with the intention of doing harm.
Examples:
"synonyms dark magic"
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Gray magic as a noun (Wicca):
Any magic which transcends or blends white magic and black magic.