Glow in the dark stones will neither shrink nor expand in concrete - even in the most extreme of weather conditions

Glow in the dark stones can be seeded into new concrete and then either polished with a grinder or exposed with a concrete retarder. Once seeded into wet concrete, these glow garden decorative stones create a unique night glow effect unlike any other type of battery or electricity-based ambient lighting solutions.Specially designed for use on surfaces where there could be barefoot traffic. Glow stone have rounded/softened edges.