You know how to make tinctures that last much longer than normal.
Benefit(s): The durations of the effects of any tinctures the alchemist brews using the Craft skill are doubled. When the alchemist uses this discovery to brew a longer-lasting tincture, the tincture imposes its normal penalties on the alchemist even if the alchemist has an ability that reduces tinctures’ penalties (such as the substance tolerance ability of the fermenter alchemist archetype).
An alchemist with this discovery can brew tinctures with normal durations.
Pathfinder Player Companion: Potions & Poisons © 2017, Paizo Inc.; Authors: Kate Baker, Eleanor Ferron, Nathan King, Lyz Liddell, Luis Loza, Alex Putnam, Alex Riggs, and David Schwartz.