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Perhaps because my middle school English teacher let us watch the movie version of “Macbeth,” I can still picture the witches chanting “Double, double toil and trouble; Fire burn and cauldron bubble.”

The three witches from William Shakespeare’s “Macbeth” famously offered the incantation “double, double toil and trouble. Fire burn and cauldron bubble,” but Oct.

Fire burn, and cauldron bubble… Geological Ingredients for a Perfect Potion “Double, double toil and trouble; Fire burn, and cauldron bubble…” “Macbeth“  Act 4, Scene 1 For everybody who´s planning to boil a magical potion or plans a witches gathering for All Hallows’ Eve, this week I will present some geological ingredients for a perfect witch’s brew: “Sweet are the uses of adversity, Which, like the toad, ugly and venomous, Wears yet a precious jewel in his head.”

Softly she quoted from “Macbeth”: “‘Double, double, toil and trouble Fire burn and cauldron bubble.’”

Double, double toil and trouble; Fire burn and cauldron bubble.