Formula: Hydragenum

Formula: Hydragenum is an alchemy formula in that is needed to craft hydragenum.
It's a possible spawn at a random diagram location or purchased from the following merchants:
* Eternal Fire Priest in Electors' Square
* Halfling merchant in Silverton
* Gremist at Gedyneith
* Merchant in the Perfumery in Beauclair 
* Wine Merchant at Chuchote Cave 
* Wine Merchant at Dun Tynne Hillside 
pl:Receptura: Hydragenum
ru:Рецепт: Гидраген
Category:The Witcher 3 alchemy formulae