A black glass was made by melting a Soda-lime silica glass under a reducing atmosphere with the addition of selenium and cobalt carbonate, CoCO3. The light adsorption of a specimens, (0.01 inch thick) in the range of 400 to 750 mu, was superior to that of commercial black glass. The maximum transmission was 27% at 75mu . the use of nickel and iron oxides is found less effective than cobalt oxide for obtaining black glass.
W A SHAH ,P I QAZI ,M S KHAN ,M A KHAN ,
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