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In the aqueous precipitation process a saturated aqueous solution of hydroxylamine sulfate is combined with a saturated aqueous solution of sodium, calcium or barium nitrate or perchlorate. These reactions result in the formation of a very difficult-to-filter sulfate precipitate and of an aqueous solution of either hydroxylamine nitrate (HAN) or hydroxylamine perchlorate (HAP). In the case of HAN the concentration is about 15%. Since most of the useful concentrations of these oxidizers are in the 50 to 85% range, water has to be removed by the costly process of distillation. Because the sulfate is difficult to precipitate, residual metal contaminants are present in high concentrations in the final product.