Used as a precipitating agent for calcium in analytical chemistry, particularly in the determination of calcium levels in blood and urine samples. Helps in the purification of rare earth elements by forming insoluble oxalate salts. Employed in textile industry for bleaching and finishing processes. Acts as a mordant in dyeing to improve color fastness. Utilized in metal cleaning and polishing formulations due to its ability to remove rust and oxide layers. Also found in some photographic developing solutions and as a reagent in laboratory research.