The method of the gaming device of the present invention contains a plurality of awards each having a value, a plurality of activators, a plurality of deactivators, and a set of indicators from which the activators and deactivators are chosen. Halide salts can be effective when used at locations where they are thermally decomposed to form reactive halogen species, or in combination with an adsorbent material such as activated carbon. or below, a heat-treated active carbon produced by heat-treating a raw active carbon at 600 to 1,200\xb0 C.