Remember in science class changing Wine to Water, PhenolThialine was chemical, it also has bunch of other dye coupler colors. intresting that cousin of this 2 way reactive, going from +ph to -ph unique color almost instantly, is also used in tiny cpu transistors or screens. Although now most likely reactive on diffent level, still reactive as fundumental chemical test way, only practical now. BTW PhenolThialine is Carboxly Not Graphene, Yet Graphene is so low in resistance, it must be important part of reaching todays incredible speeds,too. Drashek