Rich,
You may be an Expert on crest and seal chips but please leave the Roulette Chips to someone who knows what their talking about.

Shown below are Excaliber Roulettes in Dark Brown, Yellow, Fuchsia, Light Blue and GRAY and I didn't even have to clean the GRAY chip to make it look Light Blue.

Take care,
"Mr. Roulette"

P.S. DID YOU NOTICE THE YELLOW "ERROR" CHIP IN THE SCAN - IT'S THE ONE WITH THE VERTICAL INSTEAD OF THE HORIZONTAL PRINTING.