Most chains have either siver or gold side plates and shouldn’t be black. There are some chains with black side plates for the bling factor. I’ve found the some chain lubes do a great job of attracting grit, turning the chain black, and even depositing said grit on the rear sprocket. I use a biodegradable de-greaser (Motul, but I’ve heard that Simple Green works as well) to thoroughly clean the chain when I wash the bike (which isn’t often). After all the water is forced out of the chain (maybe after a short ride), I lube the chain with Bel Ray Super Clean chain lube. It does not stay tacky and attract grit. YMMV.