KGB Disappearing Ink Pen - Detailed Review + Demo examples and Ideas how to use

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KGB Disappearing Ink Pen - Detailed Review + Demo examples and Ideas how to use

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Once on paper, the ink appears normal for 15 minutes but slowly starts to disappear; fading completely after about an hour Discrete and easily

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KGB Disappearing Ink Pen - Detailed Review + Demo examples and Ideas how to use