Sulfite water for BAUER & CALLEJA, consisting of distilled water, fuming hydrochloric acid and potassium disulfite, is an important component of staining kits, especially the staining kit LH: Staining according to BAUER and CALLEJA. It is used in histology and food analysis to enable qualitative analyses of components with respect to origin and condition. Due to the specific binding ability of Schiff's reagent to carbohydrates with 1,2-diol groups, which is another component of the kit, these structures can be visualized.