JPSOR 500 Pcs Uv Beads Multi Color Changing Reactive Plastic Beads - Also Glows in the Dark (Glows in the Dark)

Packaging quantity: 500 (Please Note: The colors are packaged randomly but we will try to make the quantity of each color even.) UV Beads have assorted translucent colors: red, orange, yellow, fuchsia, blue, indigo, violet The material of products: JPSOR Scientific UV beads are extremely sensitive to natural light and change color dramatically from white to various colors when exposed to sunlight or even on an overcast day. Containing trace amounts of a photochromic pigment that are sensitive to the ultraviolet component of daylight, the beads have many different uses ranging from scientific testing of (ultraviolet) sun block materials to the creation of 'smart' jewellery.They need to be put under the ultraviolet first until they turn into different colors. Then they will glow in the dark. The stronger the ultroviolet, the brighter they will glow in the dark. If they don't put under the ultraviolet first, they will not glow in the dark. --------------The Purpose Of JPSOR Uv Beads --------------- Not only applicable to a variety of artifacts, unique gifts, also applies to all kinds of teaching, party game activities, and parents and teachers can cultivate the children's perception of colors and letters. Watch white beads change to colored when taken outside the building! When returned they turn back to white. What causes the change? Humidity? Temperature? Fresh air? Birds flying overhead? The beads contain pigments which react with ultraviolet light from the sun, even on a cloudy day. Great for teaching UV awareness! Use the beads to test the UV blocking effectiveness of sunblock, sunglasses, windows, etc. Lesson activities are included. Note: For children under the age of 6, please use under adult supervision.