Download video: How to mould glow in the dark pebbles.
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We can do better than that, since we can cast our own with two part resin and as much pigment as we like.
This video shows the making of the moulds, mixing and pouring of the resin, and the demoulding and testing of the finished shapes.
You can find the photoluminescent powder on ebay. there are two types, the older dimmer one and the new rare earth type that glows brighter for longer. The key words on ebay are Strontium Aluminate.