Annisa guards the canon of Avicenna and everyone's bookbags while the rest of her Group ransacks the cabinets, and tries to look pleased to see Marcy but not in a way where she particularly conspired to be at the worktable next to Marcy, just in the way where, when Kevin made that decision because of the Group's obvious merits as neighbors, she was pleasantly unsurprised. She looks around the room to see who else got their crucible heating first and who is going to be unpleasantly surprised when it takes like an hour to heat, it's a decent proxy for who has drilled the assignment before.
Marcy is not currently doing anything and the thing to do when you are not doing anything is to either study or build mana. She sticks the hammer back in her pocket for the moment and does a handstand.
"...So, extra work period, we can't use the shop, library anyone?"
"Sounds good. While we have this nice teachable moment, everyone knows how to tell zinc from tin, right?" Annisa sets off up the stairs.
"Zinc won't shine if it's been stored exposed to air; if it's shining it's tin. If it's not, and it's not soft enough to be lead, and you don't have time to polish it and watch it oxidize, you can lick it; zinc will taste very strongly of blood, in your mouth, and tin won't taste like much of anything. I also think they file to slightly different internal colors but the textbook says 'silvery grey' for both of them so probably that distinction is subtle enough you have to learn it through practice."