Tincture of Demiguise is an invisible liquid made from Demiguise hair (CC4.5).
When tincture of Demiguise meets pearl dust, they make a reaction that burns (CC4.5).
Bathilda Bagshot kept tincture of Demiguise in her home, and Scorpius and Albus broke into her home to use some of it to write an invisible message on Harry's blanket that would become visible when the tincture reacted with the pearl dust in Albus's spilled love potion (CC4.5, CC4.6).
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