Art tip

 If you wrinkle your paper trying to erase something, first of all, the paper is too thin. But you can still save it. If you get a burnisher or a bone folder or a cap of a marker or pen, carefully smooth out the wrinkles on one side, making sure the back end rests on a clean surface. Turn the paper over and smooth out the back. This should hopefully restore the paper for use again instead of being something to throw away.