"Euphoria, I take it? And what's that I smell? Mmmm . . . you've added just a sprig of peppermint, haven't you? Unorthodox, but what a stroke of
-- Horace Slughorn (HBP22)
Effect: Induces euphoria in the drinker, with occasional side effects of excessive singing and nose-tweaking (the peppermint would tend to counterbalance that effect) (HBP22)
History and Notes
Potion improved with notations by the Half-Blood Prince in Harry's copy of the textbook (HBP22).
References from the canon
When correctly made, the potion is sunshine-yellow (appropriate, being a colour suggestive of cheerfulness) (HBP22)
Instructions to brew this potion can be found in Advanced Potion-Making (HBP22)