Commercial bleaching can be carried out using chlorine and/or sulphur (IV) oxide. Chlorine is a strong oxidizing agent that reacts with color-causing molecules in stains, breaking them down into smaller, less visible molecules. It is often used to bleach paper, textiles, and other materials. Sulphur (IV) oxide, on the other hand, is a reducing agent that removes oxygen from color-causing molecules, thereby decolorizing them. It is commonly used to bleach food products such as flour and sugar. Both chlorine and sulphur (IV) oxide are highly reactive and must be handled with care to avoid safety hazards.