I have a collection of old chalk, some of it must be almost 100 years old, and its perfect.
the only issue with old chalk is the wrapper, I use Master Chalk that is from the 70's I bought 120 pieces from a guy a year ago, and the glue in the wrapper on some pieces has gone bad and it dosent hold the paper together and it slips off the piece of chalk, the piece of chalk is real dark and hard so it dosent make a mess, it works just fine with no wrapper and wears down normal, I use them until they are gone(I dont drill a hole down the middle). When properly used a piece of chalk lasts a long time.
Buying it in huge bulk quanities to save $$$ is ok, But how much are you going to really save? if its worth it then do it. dont worry about the product it will out live us all.:smile: