... in the dark chippings, Glow in the dark breakstones small particle Decoration for garden, path, building surface. Glow-in-dark chippings/Glow in the ... minutes,small particle size under 4mm. then glow in the dark for above 8 hours with yellow green ... garden light, photoluminescent arts & crafts, etc. Glow in the dark chippings, photolumiescent breakstone, 3mm, glow in the dark place, repeatable