GID GDV Large Grain Glow in the Dark Sand Crystals

Glow in the dark GDV, GDI or GID Sand, Large Grain Crystal is made from the purest strontium aluminate doped europium. There are 4 main daytime neutral or invisible colors Green, Aqua, Blue and Lilac and there are over 11 Day visible glow in the dark colors. These are the largest grain we can produce at between 1-2mm, has the strongest and longest glow times and the highest charge and discharge rate of any of the phosphorescent pigment powders.  They are made from a combination of specially formulated produced to our specific recipe and crystals that are created under pressure using specific chemicals in ratio. SrAl2= is Strontium Aluminate - O4 Tetraoxygen creates a mixture of persistent luminescence nanoparticles which are co-doped with Eu2+ and Dy3+. These rare elements Europium and Dysprosium create the photoluminescence within Glow in the Dark Crystals. Levels of Eu2+ and Dy3+ create the variant of colors that we produce in this man made crystal that is inert, non-reactive and non