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There is a Legacy version here.

PFS StandardOil of Keen EdgesItem 11

Uncommon Consumable Magical Oil 
Source GM Core pg. 257
Price 250 gp
Usage held in 2 hands; Bulk L
Activate [one-action] (manipulate)
When this silvery salve is applied to a melee weapon that deals piercing or slashing damage, the weapon grows sharper and more dangerous for 1 minute, granting it the benefits of the keen rune.