THESE BALLS CONTAINS PHOSPHOR WHICH WHEN EXPOSED TO LIGHT WILL GLOW GREEN LIKE THE HANDS ON A WRISTWATCH. THE GLOW LASTS ONLY SEVERAL MINUTES THE BALL MUST BE EXPOSED TO LIGHT TO EXCITE THE ATOMS. THERE ARE FLUORESCENT TYPE BALLS THAT WILL GLOW UNDER UV LIGHT AND WILL CONTINUE TO GLOW AS LONG AS IT IS UNDER A UV ( BLACK LIGHT ) WHEN VIEWED IN NORMAL LIGHT THEY ARE ALMOST WHITE.
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