_x005F_x005F_x005F_x000D__x005F_x005F_x005F_x000D_This is of the line glow in the dark, or phosphorescent, pigment sand particles. The chemical compound is and non-radioactive. After it is fully charged in the sunshine for around 1-2 hours, enjoy the effect in the dark environment The powders are made of various rare-earth doped compounds, such as strontium aluminate, calcium aluminate, and zinc sulfide, they are all guaranteed high-quality._x005F_x005F_x005F_x000D__x005F_x005F_x005F_x000D_Features_x005F_x005F_x005F_x000D__x005F_x005F_x005F_x000D_- Color: yellow green, blue green, sky blue, green, yellow, orange yellow, pink, blue, purple._x005F_x005F_x005F_x000D_- Material: sand._x005F_x005F_x005F_x000D_- Size: 13.5 x 7 x 2 cm._x005F_x005F_x005F_x000D_- Non-toxic, harmless, non-radioactive, strong environmental adsorption capacity._x005F_x005F_x005F_x000D_- Long life time,repeatedly absorbing energy and emitting light for at least 3 years._x005F_x005F_x005F_x000D_- Beautiful, colorful and wonderful. Also can be put in luminous wishing bottles._x005F_x005F_x005F_x000D_- High-intensive luminous,exposed 1-30 minutes in light it can glow in the dark 1-5 hours.Packing List:9 x 10g Bags of Fluorescent Sand