RARE EARTHS*

Abstract
Cerium oxide in glasses is the strongest oxidizing agent with respect to iron. In combination with neodymium oxide, which compensates the remaining hue, it represents the ideal decolorizer. Cerium oxide absorbs in the ultraviolet without affecting visible transmission. It is used as an enamel opacifier in France, Various other applications of the rare earths are listed, including those which are based on the abrupt division of the visible spectrum by the sharp absorption band of neodymium in the green.

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