Josh/Katie
First of all, your opening was a blast!
Second, I don't but I can point you in the direction of someone that might, Rasalas Black. She's really gifted with Potions, and I'm willing to bet we have everything she'll need to make it.
She might know if there's a way to reverse it but do we know what's caused it? Without knowing that there may not be a way to reverse it.