Just to add a little to your discussion. I first did not want
to mention to much on this subject do to the fact I was afraid
individuals would begin to start placing altered chips out for
sale. I do believe 3 or 4 chips have been placed for sale that
I feel were simply placed in Bleach for one to two days.
Certain clay molds change surface color on both mold clay and
edge insert when placed in bleach.

Jerry