At some point towards the end of the first week it becomes common knowledge she's looking for chalk, Shuichi brings her two sticks that seem to be leftovers from his own homeroom because they're still in the original box (just, the only two left inside).
The box must have been sitting open in the classroom for quite a bit, because it's a little frayed around the corners and so are the two chalk sticks themselves. It's not that uncommon for chalk to chip, so I'm sure she won't pay any mind to the X-shaped marks just very very faintly scratched into the sides with a really thin object... If she uses them, on the other hand, she might find that they're just a little bit difficult to write with compared to other chalk (maybe they're just cheap??) and a bit more chalk dust falls down than she's used to.
(It's salt from the home ec room, that was stuck down the middle after a very narrow hole was carved partway through the top of the sticks. It kind of causes any chalk lines they trace to have just the narrowest, barely noticeable gap down the middle.)
2-A's Homeroom Teacher, i'm finding something or getting shuichi killed (or both)
The box must have been sitting open in the classroom for quite a bit, because it's a little frayed around the corners and so are the two chalk sticks themselves. It's not that uncommon for chalk to chip, so I'm sure she won't pay any mind to the X-shaped marks just very very faintly scratched into the sides with a really thin object... If she uses them, on the other hand, she might find that they're just a little bit difficult to write with compared to other chalk (maybe they're just cheap??) and a bit more chalk dust falls down than she's used to.
(It's salt from the home ec room, that was stuck down the middle after a very narrow hole was carved partway through the top of the sticks. It kind of causes any chalk lines they trace to have just the narrowest, barely noticeable gap down the middle.)