actually:
a mounting putty!
odorless
does not dry out
and is used to tack photos on walls
But the drawing community uses it as an eraser. It's phenomenal!
Just cut off a small blob, form it and pat the color off the paper. Your blob will take the pigments off and embed them.
Blu Tack may look like an ordinary putty eraser, but it definetly isn't.
Not for children under 5 years.
