<P> Sleekeazy's Hair Potion is a beauty treatment used by witches to smooth and straighten hair . Hermione uses it during the Yule Ball in Goblet of Fire before meeting Viktor Krum . This is part of her three - hour beauty regimen to prepare for the ball; although it is very effective, Hermione later confesses to Harry that using the potion is "way too much bother" for daily use . According to Pottermore, the potion was created by Harry's grandfather, Fleamont Potter . </P> <P> Veritaserum is a very powerful truth potion . The name "Veritaserum" derives from the Latin word Veritas, meaning truth . Three drops of this potion are all that is needed to force anyone to respond to any question with the truth . It is first used on Barty Crouch Jr. in Goblet of Fire; in Order of the Phoenix, Umbridge demands the potion to use it while interrogating Harry about who he contacted, but is thwarted by Snape who claims he has none left having given her an entire bottle earlier in the book (although that bottle was a placebo). In Half - Blood Prince, Harry considers using the potion to get Slughorn to reveal his memories about Voldemort, but thinks better of it; and in Deathly Hallows Rita Skeeter uses the potion to extract the story of Dumbledore's childhood from Bathilda Bagshot . Rowling has revealed on her fansite that Veritaserum can be fooled using Occlumency and is hence not usually accepted in general practice in wizard courts . </P> <P> In Prisoner of Azkaban, Severus Snape brews this for Remus Lupin to help him retain his sanity and human intelligence when he changes into a werewolf . It causes a werewolf in wolf form to act subdued and tired . </P>

Who wrote magical draughts and potions in hp