Sodium Metabisulfite

salt + water + electricity = sodium hydroxide (lye), and chlorine gas...
chlorine gas bubbled thru water = hydrochloric acid...
yeast and sugar = ethanol and carbon dioxide
carbon dioxide gas bubbled thru sodium hydroxide = sodium carbonate (washing soda) and further into sodium bicarbonate (baking soda)
Iron pyrite (fools gold) + hydrochloric acid = hydrogen sulfide gas
hydrogen sulfide gas aged with air = sulfur dioxide
sulfer dioxide gas bubbled thru sodium carbonate in water = sodium metabisulfite
salt + water + electricity + yeast + sugar + iron pyrite... base materials for sodium metabisulfite