On Thu, 14 Jul 2005 wrote:

> There used to be a material for stage lighting that you dipped bulbs in
> to change color. fairly durable unless scratched.

Rosco Colorine. Its formula had to be changed dramatically (as it were) in
the 1990s to comply with VOC regulations. The old stuff dried hard and was
quite durable. The new stuff stays gummy/sticky and can only be used on
bulbs of less than 15 watts otherwise it bubbles and smokes. It's also
available now in only a fraction of the range of colors it used to come
in, none of which is suitable for car bulbs. Unfortunately, this option no
longer exists.