1.   Clean mushrooms by rubbing with a damp towel or mushroom brush, and chop coarsely.

2.   McLaughlin finds specially designed mushroom brushes too harsh, and recommends just brushing with a damp or dry cloth.

3.   But the basic tools for patching a Rembrandt etching would be a blender, an eyedropper and a plastic mushroom brush.

4.   Then a mushroom brush is used to push the fibers toward the edge of the hole, so they can bind with the original fibers.