Colouring a light bulb?

So one of my turn signal bulbs went out and although I have found plenty of places with replacements nobody has orange coloured replacement bulbs.
 
Has anyone experimented with coating/colouring a clear bulb?  I was thinking even orange marker/highlighter may work but don't want to ruin the bulbs.
 
Thanks!

Is your turn signal lens orange?

not sure about paint, but they make these little coloroed rubber boots that you put on a light bulb that are made for coloring it. you should be able to find them at lowes or ace

Len's isn't orange (aftermarket).. honestly I will just try with an orange marker.. and if that dosn't work just keep em clear.