Frixion pens are erasable. The ink turns invisible when heated. The pen has a ru... | Hacker News

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tass on Jan 24, 2017 | parent | context | favorite | on: Paper is the real 'killer app'

Frixion pens are erasable.

The ink turns invisible when heated. The pen has a rubbery tip on top which acts as an eraser when rubbed on the ink.

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