Do you mean aside from in Canon?
Yes.
More specifically, I meant in this fic.
Nope. It’s new. Well, aside from the fact that it can be logically induced the moment you see a potion’s effects.
IIRC the only potions we’ve seen so far have been the ones brewed by Quirrell for the Azkaban arc.
Though when Tonks is masquerading as a member of SPHEW one of the bullies does level a spell at her intended to dispel the effects of Polyjuice.
Yes.
More specifically, I meant in this fic.
Nope. It’s new. Well, aside from the fact that it can be logically induced the moment you see a potion’s effects.
IIRC the only potions we’ve seen so far have been the ones brewed by Quirrell for the Azkaban arc.
Though when Tonks is masquerading as a member of SPHEW one of the bullies does level a spell at her intended to dispel the effects of Polyjuice.