This is a pen named “FRIXION BALL KNOCK”
and produced by PILOT.
The bear good humor below was drawn with this pen.
It's fairly normal one.
I rubbed with a rubber
attached to the reverse of the pen
point. Then…
Ink drawn has disappeared.
It seems to disappear by frictional heat.
In this series, there are colored pencils or highlighter
pens other
than ballpoint pens.
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