Disappointing. The "ink"...
June 5, 2015
Disappointing. The "ink" is thick and gummy, so when you erase it you're likely
to smudge it around the page, making precise drawing impossible. And since the
ink stays on the page, only invisible, it still prevents you from writing or
drawing on that part of the page normally.
I know some people like these -- but I suggest just buying one or two to try out