Question: what are food additive numbers?
Answer: 100 to 199: Food colouring. ...  200 to 299: Preservatives. ...  300 to 399: Antioxidants. ...  400 to 499: Thickeners, emulsifiers and stabilisers. ...  500 to 599: Acidity regulators and anti-caking agents. ...  600 to 699: Flavour enhancers, including monosodium glutamate (E621) or MSG.