Explanatory notes
… same purposes as the acid sulphite and in viticulture and photography. (c) Sodium sulphite (neutral sodium sulphite), … (with 7 H 2 O) colourless, soluble in water. Used in photography, in breweries, for treating rosin, as an … metabisulphite), a white powder or in scales, used in photography, for the carroting of hair in the felt hat …