how to recognize the fake blue diamond chalk?

Rub a little on your gums, yeah, thats the ticket. If your mouth turns blue, you got the good stuff.
 
Take a cube of the chalk and rub a corner of it hard on a piece of glass. If it cuts, then it's the real Diamond.
 
My thoughts also.
Now if they try to knock off "Hanks" water then we have a problem.

I tried a piece of Blue Diamond today and I don't know if it was old or fake, but it didn't work.
So I gave it to Phil The Fin...less one
He was thrilled
 
I always take a piece and stick it between my butt cheeks on a really hot humid day. After a few hours if it falls apart and get all pasty, its the fake stuff. :D
 
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