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Show Changing the Color of Qema. It Is possible to change the color of precious and semiprecious stones by exposing them to the action of radium. A Frenchman who hns devoted himself him-self to this study has obtained remarkable re-markable results. . He .bought sapphires sap-phires of different kinds and put them In a box with a small quantity of radium. At the end of a month the transformations were as follows! White sapphires hud become yellow; blue, green; violet, bluo; wine-colored tone, red; dark blue, violet. |