The present invention provides a method of using a neutral ionic liquid to at least one of stabilize a peroxidic explosive and to produce a stable solution of the peroxidic explosive which includes providing the neutral ionic liquid and using the neutral ionic liquid to at least one of stabilize the peroxidic explosive and to produce the stable solution of the peroxidic explosive. A sealing member, which unsealably seals the discharge opening, includes an engageable projection engageable with an engaging member provided in the image forming apparatus and a support for displaceably supporting the portion. A porous gasket is pinched between the porous core and the base. A light sensing part outputs an output signal corresponding to an intensity of the light incident through the light guide part and the light distribution part when a touch occurs.