A real one. I've spent the last four weeks brewing it for us to try.
[ She reaches over for a small vial at the side of the cauldron, holding it out; the colourless liquid looks very like water. ]
It doesn't taste like anything and it's odourless, too. While it is a truth potion people can only tell the truth they know - so if I was raised thinking my name was Sarah, even though it was Hermione, I would say my name was Sarah if asked.
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[ She reaches over for a small vial at the side of the cauldron, holding it out; the colourless liquid looks very like water. ]
It doesn't taste like anything and it's odourless, too. While it is a truth potion people can only tell the truth they know - so if I was raised thinking my name was Sarah, even though it was Hermione, I would say my name was Sarah if asked.