1)chlorine
2)calcium propionate
3)sodium nitrate
4)sodium nitrite
5)sulfites (sulfur dioxide, sodium bisulfite, potassium hydrogen sulfite, etc.)
6)disodium EDTA.
Antioxidants include BHA and BHT. Other preservatives include formaldehyde (usually in solution), glutaraldehyde (kills insects), ethanol and methylchloroisothiazolinone
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