Find some of this - it will make your chain black in short order and also is supposed to be a good lube.
GRAPHENlube World's Best Wax Lubricant Period. (absoluteblack.cc)
Or just ride your bike with normal chain lube, it will get dirty and black.
If your chain were pristine clean, you could probably spray paint it and it would look good for a short time. It would have to be totally pristine though.