Strange thing happened today when I was doing another large mixed batch of poker chips in the ultrasonic cleaner today. I believe a small amount of clay material reacted with the metasilicate solution and bled off the surface of the chip. Strangely enough, it only happened with a green coloured chip, and it didn't happen with older ASMs of navy, brown, off-white, orange, and black chips. I do not suggest you use metasilicate with CPC chips without advanced testing. Take a small sample (a few ounces) of the detergent solution and put in a test chip - if there is an immediate change in colour of the detergent solution, dump the chip into some rinse water and do not proceed further. It might be worth doing this simple test with any ASM chip as well. Any corroboration of this issue would be helpful.