"A whole bunch of counter-charms, which we've agreed means it's not a spell. So it must be some sort of potion residue?" Harvey really was a little out of his depth here. He hadn't worked with things like this since Hogwarts. All of his work experience was more with people than magic and so therefore he was a little out of practice.

"I was tasked with seeing if somebody with better knowhow could figure it out." It made more sense to outsource a potioneer than to bother somebody at the ministry who had other things to work on. Though he was sure she too had other work to do, he was hoping she might be able to figure it out quickly.