New Pencil Stays Erasable for 3 Days

... Then Turns Permanent

Sharpie has developed a new writing implement that’s a cross between a pen and a pencil. The writing it produces stays erasable for three days. Then it becomes permanent. At Wired, Charlie Sorrel writes:

The Sharpie Liquid Pencil contains an “ink” made from liquid graphite and lays it down just like a pen. Once written, you have three days to think on the validity and weight of your words. During this period you can erase it just like pencil-marks. After the three days is up, the pencil lines will turn to ink and remain inscribed forever.

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