I thought I had a new find. A black L's chip from the old Gold Rush Casino in Sonora, CA. Only a brown and blue chip are known to exist. However, the chip just didn't look right, a little too shiny. I took the risk of cleaning with a little lacquer and low and behold a blue chip emerged with a nice gold hot stamp that had been protected by the paint. I have know idea who or why these chips were painted, but beware if you spot some black ones on eBay.