Pens With Vanishing Ink? How To Identify Them.

Pens With Disappearing Ink after few minutes is common in my house as the kids use it to practice writing.
In this video I am going to show you how it works, How long it takes to Auto vanish and how you can detect which pen is auto vanish before you even write with it on paper.

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[Austinredstoner]

Thank you. Where can I buy pens with vanishing ink I'm bad at writing so I want to practice.