Pure strontium aluminate glow powder with absolutely zero additives or fillers. This is critical because even slight amounts of impurities will greatly reduce the intensity of the glow. Strontium aluminate Different colors provide different glow brightness! Keep this in mind when making your color choices or when mixing with color pigments. As an example, it is very difficult to mix red with a dark shade of color pigment such as black. In the daytime, the powder appears off-white. Once charged by UV light, the powder puts off a brilliant colored glow. We offer a range of size options from 10 grams to one kilogram for your specific needs. 10 grams will be enough to make approximately 10 rings or similar projects. The glow powder can be mixed with color pigments to create your own unique shade, or it can be left uncolored to provide a brighter glow. If you mix it with pigment, it is recommended that you perform color samples with your selected adhesive because the color will change slightly when whetted. Most light sources will charge the glow powder. You can use the light on your phone, lightbulbs in your home, etc. But for best results, use a UV flashlight or direct sunlight. Once charged, the powders put off a bright glow which gradually decreases in intensity over the next 4-8 hours depending on how thoroughly the powder was charged.