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Colorizing and decolorizing glass is done in the same way from what I can tell. Glassmakers have over the years substituted manganese by sodium nitrate or selenium in decolourizing. http://www.bartleby.com/65/gl/glass.html http://www.worldofmolecules.com/elements/selenium.htm http://1st.glassman.com/articles/glasscolouring.html
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