Again, weak on chemistry, but what about a Copper compound? Although those like to stick to just about anything and not let go easily, that would give you your cyan as well, but it might not be blue enough. CuAu? Nope, they are in the same period so they won't stick well, but they are in the same period so in theory there is a way to make Cu light sensitive. No, that's silly, but if it works put me in a footnote.