Although David pretty well covered it, be assured that there are many Wisconsin chips that were once thought to be Gold or Silver, when they were just Gold that had turned silver.

A good example is the Majestic Pines, where the best chips are still gold, but most are silver = chipguide page: http://www.themogh.org/cg_chip2.php?id=WIBRMP

I have found the $1, $5 and $25 with GHS but I'm pretty sure the best $2.50 I own, is partially gold, mostly silver.

IMHO cleaning and use.