Sulfites
- sulfur dioxide and sulfites have long been used as preservative.
- serving both as antimicrobial substance and as antioxidant.
- sulfur dioxide is a gas that can be used in compressed from in cylinders.
- it is liquid under pressure of 3.4 atm and can be injected directly in liquids.
- it can also be used to prepare solutions in ice cold water.
- it dissolves to form sulfurous acid.