Pearl dust is an expensive, fairly uncommon potion ingredient used in love potions (CC4.5).
When pearl dust meets tincture of Demiguise, they cause a burning reaction that can put holes in fabric (CC4.5).
When Albus and Scorpius went back in time to the day Albus's grandparents were killed, they use tincture of Demiguise to write an invisible message on Harry's blanket, knowing that it will become visible when a love potion gets spilled on it in the future (CC4.5).
Potions Connection
Ingredient in love potions.
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