The ointment is dumb. It doesn't follow any of the rules. When my players bring it up, I tell them it must be a typo.
The "True Seeing Ointment" we use follows this formula:
Crafting Strength+2 shifts for limitation "only fairy glamours" (as opposed to any veil) put into duration (allowing it to last for 1 scene). So it's a Crafting Strength Alertness replacement that last for one scene against a specific type of effect.
I will also allow them to create an alertness replacement to pierce any illusion, but it only lasts for one roll.
"Only fairy glamours" could be replaced with "only veils" (of any type, but would not cover other illusory effects), "only Orphic enchantments" (a specific type of sponsored magic), or "only illusions created by Mortal Magic".