An improved process for the hydrolysis of nylon polymer is herein disclosed using ionic liquids and optionally one equivalent of sulfuric acid per amide residue of the polymer. The display electrodes and the wirings respectively have a bilayer structure of a transparent conductive layer and a metal layer. The lateral guard is selectively moved, such as responsive to engagement by a workpiece, between a non-cutting position and a plurality of cutting positions. The light generating section includes a plurality of LEDs and a mixing chamber.