Glow Brick is a Glow-in-the-dark pigment trapped inside a real light bulb. Then the light bulb is encased in a solid block of Acrylic resin. The mysterious optical effect is caused by light diffracting in the tiny space between the glass of the light bulb and the resin, the space forms when the resin shrinks by a tiny amount during the production possess. More at UncommonGoods.
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