I want to do some glass art with my teens. There were some materials that my husband use to use that would simulate stained glass. It was a black sustance that you "draw" onto the glass, let dry and then paint. Anybody know what I'm talking about?

I have become interested in art glass.
Art glass, and sculpture-like works of art rendered in the finest glass.
Who are some of the masters of this art,what are the titles of some of their works, and where are some of these works on view?

i've taken a suddened interest in glass art. does anyone have any good sites about information and hisotry or about artist?