This magical substance resembles the fine oil used to clean and protect metal armor and weapons. 

If it is carefully rubbed on the blade of any edged or pointed weapon, the oil will have the effect of making it equivalent to a magic weapon. 

One such application will last for 9-12 rounds. 

A flask of the substance will contain from 3-5 applications. 

The dweomer of the oil of sharpness is determined by die roll:

100 XP or 1,000 gp per application