Potassium sorbate --- colorless to white flaky crystal or crystalline powder, odorless or slightly odor. Not stable in the air. Can be oxidized coloring. Molecular weight 150.22. Hygroscopic. Soluble in water, ethanol. Mainly used as food preservatives are acidic preservatives with organic acids used to improve the effect of anti-corrosion. To potassium carbonate or potassium hydroxide and sorbic acid as raw materials in the system.