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There is a Legacy version here.

PFS StandardExploitive Bomb Feat 16

Additive Alchemist 
Source Player Core 2 pg. 69

You can mix a refractile substance into an alchemical bomb to foil resistances. Choose one damage type the bomb can deal. Any damage dealt by the bomb—including initial, splash, and persistent damage—ignores an amount of that resistance equal to your level.

Traits

Additive:

Feats with the additive trait allow you to add special substances to alchemical consumables you create when you use Quick Alchemy to create a consumable (you can't use additives with quick vials). You can add only one additive to a single alchemical item, you can add an additive only once per round, and most additive abilities specify a subset of alchemical consumables you can add them to.