charlie (in email@example.com)
| Morris Dovey wrote:
|| charlie (in firstname.lastname@example.org)
||| Morris Dovey wrote:
|||| SimonLW (in 4582697e$1 email@example.com) said:
||||| On a similar note, most shops have no clue how to tell the tin
||||| side from the air side of float glass. This is not well known,
||||| but important to businesses and artists who paint or print on
||||| the glass. A glass business should know this.
|||| I guess I'm among the clueless. How does one tell; and why is it
||| glass enamels are really minerals. some react with tin, giving
||| different colors than are intended. for example, some blues are
||| copper based, and can react with the tin layer to make a fugly
|| Interesting. Usually I'm trying to /not/ paint glass - but this is
|| good information to have filed away. Next time I'm near my local
|| glass shop I'll stop in and ask for a demo.
| you're misunderstanding. these are glass paints that are fired onto
| (and becoming one with) the glass in a range of 1000-1400F. think
| church stained glass windows with faces fired onto them. latex/oil
| paint has no affect with the tin layer.
Aha! Ok - now I understand a bit better. Thanks.
| typical window glass shops, i would expect, would not know of this.
| a decorative glass store (stained, fused, structural, etc) would.
Gotcha. The shop I visit when I'm buying glass might - they do a fair
volume of special order business and seem fairly savvy. They're also
patient when I walk in and ask a lot of ignoramus-type questions. I
have the distinct impression that they /like/ glass. I like its
utility; but they seem to like the stuff itself.
||| you can detect it with a germicidal uv light in a dark room. the
||| tin side glows. it also beads up water differently, or if you
||| have metal filings, some people can tell by licking the glass.
|| Now this info opens up some really interesting possibilities. Does
|| the tin show up brightly; and is it purely a surface deposit (IOW,
|| will it rub/scrub off)?
| float glass is made by floating molten glass onto a bed of molten
| tin in an oxygen-free atmosphere. the tin layer has to be blasted
| off to remove it. btw: there is tin layer in old fashioned plate
| glass, but hardly anyone makes that anymore.
| it's not that bright, but can be seen pretty clearly in the dark.
| germicidal uv lights are not common, nor are they generally healthy
| to have around and be looking into a lot. they typically come with
| a lot of warnings and a purple glass shield which has to be removed
| to get the correct uv light out of them to show the glowing.
Understood. I've seen these things; and have some friends that use
them (or something very like) for special effect signage with shields
so that the tubes can't be seen directly.
|| I think I'd rather go with the UV or water bead tests than lick
|| something without knowing where it's been or who might have licked
|| it before me... :-P
| the beading is very subtly different. you can also wash it before
Thank you, Charley (and Simon). Like a lot of other people, I've been
fascinated with what can be done with light and glass and color. It
has a way of catching and holding the eye much the same way as does
fireworks - except that it's much more lasting.
DeSoto, Iowa USA