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Show Channinq the Color of Gems. It is possible to change the color ot precious and semiprecious stones by exposing them to the action of radium. A "Frenchman who lias 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 eiJ of n month the transformations were as follows: White sapphires had become yellow; blue, green; violet, blue; winer-vlored stone, red; dark blue violet. |