The added amount is about 0.5%. The amount of potassium sorbate added to 500g of salted radish kimchi is about 0.05%. Potassium sorbate, also known as potassium 2,4-hexadienoate, is the potassium salt of sorbic acid. The molecular formula is C?H?O?K. It is white to light yellow scaly crystals, crystal particles or crystal powder, odorless or slightly odorless. It smells bad and will easily absorb moisture, be oxidized and decompose and change color when exposed to the air for a long time. Easily soluble in water, soluble in propylene glycol and ethanol. Often used as a preservative.