That's a pretty good Wikipedia article. So actually IF you really want to alter the properties then I suppose that one could buy a gross of Masters for like $20 and start experimenting by crushing it into powder and adding stuff to it. Try everthing in the house 
Build your self a little compression jig so you can get the chalk back into a useable shape and there you go.
Since the Blue Diamond is like $15 a cube???? there is obviously a lot of room between $20 a gross and that to make a killing in the chalk biz.

Build your self a little compression jig so you can get the chalk back into a useable shape and there you go.
Since the Blue Diamond is like $15 a cube???? there is obviously a lot of room between $20 a gross and that to make a killing in the chalk biz.