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Ammonium sulfate is a mildacid forming salt which can be substituted for vinegar or citric acid. Its great advantage is that it forms acid slowly, starting from a neutral ph when first dissolved in room temperature water, and releasing more acid as the dye bath is heated to around 150F. The gradual release of acid promotes more level colors than citric acid produces; that is, smoother, more perfectly solid colors, as opposed to mottled colors.