powder which is also green as silicone in production. The UV powder is kind of photochromic material. We use it to make this change. Photoreceptor color is irradiated by ultraviolet or sunlight, absorbs ultraviolet or sunlight, and produces changes in color. When it loses ultraviolet or sunlight, it returns to the original color. Photoreceptor products, after sunlirubber band bracelet bandsght or ultraviolet radiation, can absorb the energy of the sun or ultraviolet rays, produce changes in the molecular structure, lead to changes in the absorption wavelength, and produce color changes; when the sun or ultraviolet energy is lost, the original molecular structure is restored and the color of the cost is reduced. Application of photosensitive discoloration material: coating, suitable for various surface coating products, including PMMA spray paint, ABS spray paint, PVC spray paint. Ink, printing of various materials, including fabric, paper, synthetic film, glass, etc. Plastic products, suitable for various kinds of plastic PP, PVC, ABS, silicone rubber and other materials, such as the ejection, out of shape. custom-camo-silicone-wristbandscool-silicone-wristbands 10pcs keychains free. All the free wristbands and keychains are same design of the one you order. We are the only one to do it. Maybe you will ask why we offer so big discount, will the quality be low? The answer is that we are exactly manufacturer rather than trader. We do production, design and sales all ourselves. So all the price is wholesale price, factory price. Our strategy small profits and quick sales. No extra cost, no MOQ. Event one pcs we can make with no extra cost. We are online 24 hours 7 days. You can contact us via email, phone call or live chat. We are appreciated that we can send us inquiry with design detail. All the ditital proofs are free, no matter you order or now. We can do super rush order in 2 days. One day production and one day shipping. Trubber band bracelet bandsime is guaranteed or we will refund if it dealy.