Aahhh.. I remember when we learn to make our own chalk erasers years ago, when chalks and blackboards existed at every class rooms in achools, but nowadays in my country most svhools use whiteboards and some of the schools already use a digital boards too😐. Your project is really awesome, hope that more schools would buy this ecofriendly erasers, they can just wash it and re-use if the chalk-dust to thick, right!