Guest kiplacombe Posted February 7, 2005 Share Posted February 7, 2005 I was wondering what compounds are used to make red, amber, and green colored glass in old traffic lights. Google was no help at all. This is for an assignment due really soon, so if anyone knows, tell me. Link to comment Share on other sites More sharing options...
atinymonkey Posted February 7, 2005 Share Posted February 7, 2005 Copper gives green glass, gold gives red, silver gives yellow. look for 'stained glass' in google, rather than 'traffic lights'. Link to comment Share on other sites More sharing options...
YT2095 Posted February 7, 2005 Share Posted February 7, 2005 Barium salts (Chlorate) are used for Green. Sodium is used for Yellow. and Strontium is used for Red. Copper salts are used for Blue edit: Oooops, just realised, it was a Gl;ass thingy and not a Pyro one (we have traffic lights in those too). Chromium salts give the yellow copper for the green I`m not too sure about the red? cobalt gives Blue. Link to comment Share on other sites More sharing options...
jdurg Posted February 7, 2005 Share Posted February 7, 2005 Cadmium Sulfide and traces of Selenium added to molten glass gives it a red color when it sets. Link to comment Share on other sites More sharing options...
YT2095 Posted February 7, 2005 Share Posted February 7, 2005 CdS also used in PhotoCells, slow reactions, but good stuff Link to comment Share on other sites More sharing options...
atinymonkey Posted February 7, 2005 Share Posted February 7, 2005 Cadmium Sulfide and traces of Selenium added to molten glass gives it a red color when it sets. Old traffic lights, as in 'not new'. The first traffic lights were installed in 1868, and most probably used the old methods for colouring : - http://www.thestorefinder.com/glass/library/history.html Link to comment Share on other sites More sharing options...
Guest kiplacombe Posted February 8, 2005 Share Posted February 8, 2005 Thanks. I'm actually going to pass. Link to comment Share on other sites More sharing options...
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