Dyes & Chemicals are primarily used in the pulp and paper industry. Chemical is used in water treatment as an oxygen scavenger agent, in the photographic industry to protect developer solutions from oxidation and (as hypo clear solution) to wash fixer (sodium thiosulfate) from film and photo-paper emulsions, in textile industry as a bleaching, as a desulfurizing and as a de chlorinating agent and in leather trade for the sulfitization of tanning extracts. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. Dyes & Chemicals are used in the production of sodium thiosulfate. It is used in other applications, include ore flotation, oil recovery, food preservatives, making dyes, and detergent. Chemical forms a biSulphite adduct with aldehydes, and with ketones forms a sulfonic acid.