|copies=[[Hogwarts School of Witchcraft and Wizardry|Hogwarts]] [[Hogwarts Library|Library]] ([[Restricted Section]])
|copies=[[Hogwarts School of Witchcraft and Wizardry|Hogwarts]] [[Hogwarts Library|Library]] ([[Restricted Section]])
}}
}}
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{{Quote|"''MostePotentePotions?''"sherepeatedsuspiciously.|Librarian[[IrmaPince]]doubts[[HermioneGranger]]'sintentionsintheRestrictedSection.|Harry Potter and the Chamber of Secrets}}
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{{Quote|Shestalkedawaybetweentheloftyshelvesandreturnedseveralminuteslatercarryingalarge and moldy-looking book.|A description of thebook.|Harry Potter and the Chamber of Secrets}}
'''''Moste Potente Potions''''' was a [[list of books|book]] by [[Phineas Bourne]]<ref name="author" /> that gave instructions on how to brew advanced [[potions]].
'''''Moste Potente Potions''''' was a [[list of books|book]] by [[Phineas Bourne]]<ref name="author" /> that gave instructions on how to brew advanced [[potions]].
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Hermione obtained a permission slip to check ''Moste Potente Potions'' out of the [[Restricted Section]] from [[Gilderoy Lockhart]], claiming that the book contained information on [[poison|slow-acting venoms]] that she thought might help her understand what Lockhart had written on this subject in ''[[Gadding with Ghouls]]''.
Hermione obtained a permission slip to check ''Moste Potente Potions'' out of the [[Restricted Section]] from [[Gilderoy Lockhart]], claiming that the book contained information on [[poison|slow-acting venoms]] that she thought might help her understand what Lockhart had written on this subject in ''[[Gadding with Ghouls]]''.
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Hermione then spent severalmonths brewing the Polyjuice Potion in [[Myrtle|Moaning Myrtle]]'s [[Second-floor girls' lavatory|lavatory]], using ingredients stolen from [[Severus Snape|Professor Snape's]] stores.
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Hermione then spent onemonth brewing the Polyjuice Potion in [[Myrtle|Moaning Myrtle]]'s [[Second-floor girls' lavatory|lavatory]], using ingredients stolen from [[Severus Snape|Professor Snape's]] stores.
==Behind the scenes==
==Behind the scenes==
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*''[[Harry Potter and the Chamber of Secrets (film)]]''
*''[[Harry Potter and the Chamber of Secrets (film)]]''
*''[[Harry Potter and the Deathly Hallows: Part 1]]''<ref>See [[:File:Deathly Hallows Books.jpg|this image]].</ref>
*''[[Harry Potter and the Deathly Hallows: Part 1]]''<ref>See [[:File:Deathly Hallows Books.jpg|this image]].</ref>
Moste Potente Potions contained recipes for many dangerous, controversial, and arcane potions, which required advanced skill in potion-making to brew. Gruesome illustrations showed the effects of such potions. The Hogwarts Library accordingly kept its copy of this book in the Restricted Section.
Hermione obtained a permission slip to check Moste Potente Potions out of the Restricted Section from Gilderoy Lockhart, claiming that the book contained information on slow-acting venoms that she thought might help her understand what Lockhart had written on this subject in Gadding with Ghouls.
Also in the book, there is a picture (Figure VII) of a woman with a grotesquely large spider on her head, almost worn like an ornament. Whether or not this is an effect of a potion is unknown. It is possible that it is the side-effect of accidentally imbibing a Polyjuice Potion contaminated by spider hairs, similar as to when Hermione was partially transfigured into a cat when her Polyjuice Potion was contaminated with cat hair.