Ambrose double-checked the book, ready to correct her, when he frowned. "Book says one to two, actually. We'll know when it turns from grey to purple." He checked his watch to note the starting time, and then sat down on his stool, watching the potion bubble.
All things considered, he'd definitely had worse potions partners. He'd had better ones too, of course, but that was more in terms of company than skill. "You think we'll have to try it?" he asked, glancing around at the other groups, most of which were at the waiting stage, but some of which had run into trouble at one point or another.