Been a fan Master for years and have had no interest in all the newer chalks.
For quite a while now I have bought the occasional box and take a few new pieces with me to the pool hall or tournament in a pouch.  Very recently I bought another box.  The first thing I noticed about the chalk cubes in this new box was that the holes in the chalk were drilled/formed a bit deeper than previously.  No biggie.  But now, having gone though over a dozen pieces, I can tell that, at least from the box I got, the chalk is a different, *much* softer formulation.  I mean, I could probably go through a cube of this newer chalk in one extended session of four to six hours.
And my hands.
After just a couple of hours, my chalking hand is blue  --  really blue.  If I play for four hours or longer, we're talking Smurf hand.  I can't imagine how much chalk is landing on the cloth.  Anyone else?
Lou Figueroa
two hours play