This is the most satisfying thread I have read in years :) My contribution: Pilot Frixion pens. The ink erases with heat, which can be applied by rubbing the o

This is the most satisfying thread I have read in years :) My contribution: Pilot Frixion pens. The ink erases with heat, which can be applied by rubbing the other end of the pen on the paper. This pen has eliminated my need for pencils.