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It is most likley semen

EDIT: Grow Up!! It's called the Drink of Despair and was most likely invented by Voldemort himself. It induces fear, extreme thirst and delerium. it cannot be changed or moved by any method other than drinking. (Note that the name of the potion is actualy the name of the music played over the scene in the film in which the potion appears, however this is now accepted as the title of the potion untill otherwise specified by someone 'in-the-know'.)

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