Hm... Good info about walnuts, but being gray doesn't seem to be an issue. The only real case I've heard of was not with CS, but with high doses of Silver Paste. Can't remember where I heard it either. Any one here ever turned gray? If this is a problem, there is likely a lot of factors, and we know that all CS is not in the same boat. Not really even safe to buy the stuff. Making your own will ensure the safety and the quality of the product. Anyway, don't most people turn gray anyway when they get old? ;) (Thanks about the walnuts, that is so cool!)