Autumn Leaves acrylic stamp Universal Symbols, easy to use and easy to store right in the clamshell package. Carefully peel the stamp off the plastic sheet and apply to an acrylic block.  The clear plastic allows for precision placement.  After use, clean with soapy water or stamp cleaner and reapply to the plastic sheet when dry.  Stamp inks are recommended, but also try with acrylic paints for anytime, anywhere stamping.