Manuscript page: Petri's Philter

Manuscript page: Petri's Philter is an alchemy formula in that is needed to craft Petri's Philter.
It's a possible spawn at a random diagram location starting at level 2, or purchased from the following merchants:
* Otto Bamber at the Herbalist's Hut northeast of Oxenfurt
* Yolar at Gedyneith
* All herbalists in Toussaint except Pinastri 
ru:Рецепт: Зелье Петри (Ведьмак 3)
Category:The Witcher 3 alchemy formulae