Glow-In-The-Dark Crystal Growing Kit
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While it won't be able to grow into Superman's crystalline Fortress of Solitude, this cool new Glow-In-The-Dark Crystal Growing Kit will grow into a large crystal structure that glows green like a chunk of Kryptonite. Just mix the crystal powder with hot water, let it cool, and then watch as it begins to grow spiky crystal formations on a phosphorescent base that glows in the dark after being charged in bright light. Check out the video below to see it in action.