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NOT ALL TUMBLER DESIGNS WORK WITH UV AND/OR UV GLOW IN THE DARK TUMBLERS. IF THERE IS TOO MUCH INK IN THE DESIGN, THE UV AND/OR GLOW FEATURE WILL BE DIFFICULT TO SEE.
A UV TUMBLER WILL CHANGE COLOR IN SUNLIGHT. A GLOW TUMBLER MUST BE CHARGED IN SUNLIGHT TO GLOW IN A DARK ROOM. SOME TUMBLERS ARE UV ONLY, GLOW ONLY AND OTHERS FEATURE BOTH. UV/GLOW FEATURE WILL FADE OVER TIME.