Glow-in-the-dark pebbles from Graham Products are non-radioactive and free of toxins. They glow as a result of photoluminescence - meaning that their radiance is induced by the absorption of visible light. School-age kids get a valuable science lesson from simply interacting with the stones. The pebbles are roughly 1" in diameter and may.. Glow Pebbles, Gravel & Shells. Add wow factor to features around your home, garden or aquarium with glow in the dark gravel, pebbles and even seashell decorations that glow at night or under UV light. Versatile with endless uses, green glow in the dark gravel shines with a super bright glow to highlight features in your home and garden.

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