|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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A Hate Potion is a potion which reveals the worst traits and habits of a particular person to the drinker.
The Hate Potion was recommended by the Daily Prophet's advice column for witches and wizards who are emotionally attached to a person who does not return their feelings. Although not guaranteed for a person to completely lose their feelings for a loved one, it does show the drinker the person's worst traits and habits, and so discourages them from creating a relationship with that person. The Hate Potion is opposite of the Love Potion, as it can undo the Hate Potion's effects.