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Tag: disappearing ink (3)

Tag: disappearing ink (3)

When you write, draw, or color with these normal looking ballpoint pens, the ink will display as normal. However, if you apply heat from a nearby flame then the ink instantly disappears and then it can be made to ... Continue
This innovative highlighter uses classic yellow ink that fades away completely without a trace after five months.
After nearly ten years of research and development, colored bubbles can finally be blown in an amazing air-filled spectacle of spectrum!

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