For colours in any shade that you would like and are made for glass.  Just
go to your local hobby store and ask for glass painting which is used in
many fake stained glass pictures.

I have used it to repair a glass back lense on a 58 Ghia.  The red color had
faded and it did a very good job.

My mother does stained glass and glass painting.  There are to types one of
them must be put in an oven and baked on.

Chris.....Norway