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Usage Principle: The tip of the inkless pencil friction on the paper to decompose the alloy metal molecules and leave it on the surface of the paper.

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Usage Principle: The tip of the inkless pencil friction on the paper to decompose the alloy metal molecules and leave it on the surface of the paper.

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✅[Eternal inkless pencil] The reason why this metal inkless pen can write without sharpening a knife or ink is that the tip of the pen rubs on the

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