t is made by the same technology with the normal bracelet but adding the glow powder . The powder can be added into the band body or the ink for the printed or debossed colorfilled style bracelet. The glow powder is eco as well as the silicone material bracelet. When absorbs enough strong light before being put in the darkstores that sell silicone wristbands, it glows blue, green or red depending on the style of the glow power. The glow will last for hours and gradually weaken. But when reabsorbs the light , it glows again like original shows. It is the most favorable item for the night event. It looks so good stores that sell silicone wristbandsin the dark reflecting the logo custom. Hope this can help you for the glow in dark silicone bracelets. A uv silicone bracelet can transfer its color darker under sunshine when absorbing uv light. It is not only with good looking appearance but also indicating the strength of the uv index. So some uv silicone bracelets made as the indication with the ruler of levels of index. Wearing on the wrist to avoid long time staying under strong uv. So what makes it uv transfer ? The answer is the UV phosphor which use uv energy to open the sensitive molecular bond and make it jump from low energy to high energy level There will be a change from visible light to visible light, resulting in the changing color from light to dark. It become a uv silicone bracelet when the UV phosphor is put into the silicone mass and produce it a band. usb-wristband-wholesaleunder-armour-silicone-wristbands Many people make custom braclet for their events. It is cheap and and esay to promote. So it becomes popular promotional gift. Usually we put a slogan and simple logo on it with printed, colorfilled and embossed printed style. But you know, we can even put a colorful photo on with the CMYK printing. Let me show you. Four-color printing mode is a kind of color matching mode used in color printing. It uses the principle of three primary colors mixing and black ink to mix and superimpose four colors to form full-color printing. The four standard colors are Cyan, Magenta, Yellow and black. These four colors are usually used to reproduce thousands of other colors in printing. Most of our customers will make the photo on the figured wristband. It will be printed on the figured part of the wristband. Looks much more understanding.