Rafe
It’s the tension, that gets you. People think it’s just storage, but it's about the structural integrity of the thread against the resin density. My mother used to sort the ceramic ones separately because if the air got too damp, the whole batch would warp. If you don't account for the hygroscopic nature of the bone buttons, you're just asking for the fibers to snap. It's basic physics, really. Most people just throw them in a jar and wonder why the seams pop.