Sulphuric acid is the alternative British spelling for sulfuric acid, H2SO4, the strong inorganic acid used as a processing aid in food manufacture. British chemical and food-industry literature uses this form for the same corrosive acid employed in pH adjustment, additive manufacture, and ion-exchange resin regeneration in sugar refining and water treatment. Handling precautions are identical under either spelling: full chemical-safety discipline, strict segregation from production areas, and no residues permitted in finished foods. The spelling variant must be recognized in international documentation.