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The under $25 Kickstarter pen you need to add to your everyday carrythe inkless pen writes lightly with microlayers of its own metal. Etch noticeable strokes on many materials, including paper, cardstock, plastic, wood, or any surface where the solid ink can stick.
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Amazon S3 on MSNDiy Invisible Ink: Secret Ink Uv Pen Making Guide"Follow The King of Random for more exciting experiments, life hacks, and creative science projects. From crazy builds to fun DIY ideas, we test wild concepts and bring science to life in unexpected ...
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