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Coloring Diamonds by Cathodic Rays

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Pacific Press Publishing Association · Mountain View, California · Feb 15, 1910

FromSigns of the Times, Vol. 37, No. 7.

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Coloring Diamonds by Cathodic Rays

A new discovery has been made in France by which diamonds can be so exposed to the cathodic rays as to take on a delicate rose tint; still further exposure gives them the color of Madeira wine. These tints can not be removed except by an exposure to 300 degrees of heat.