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Plain caramel, caustic caramel, or spirit caramel (Class I): E150a, contains sugar and sometimes acids, alkalis, and salts other than ammonium and sulphite compounds.
Caustic sulphite caramel (Class II): E150b, may contain sulphite compounds.
Ammonia caramel, baker's caramel, confectioner's caramel, or beer caramel (Class III): E150c, may contain ammonium compounds; used in beer, soy sauce, and confectionery.
Sulphite ammonia caramel, acid-proof caramel, or soft-drink caramel (Class IV): E150d, may also contain both ammonium and sulphite compounds; used in acid environments such as soft drinks
http://www.nationmaster.com/encyclopedia/Caustic-sulfite-caramel
/mattias
Plain caramel, caustic caramel, or spirit caramel (Class I): E150a, contains sugar and sometimes acids, alkalis, and salts other than ammonium and sulphite compounds.
Caustic sulphite caramel (Class II): E150b, may contain sulphite compounds.
Ammonia caramel, baker's caramel, confectioner's caramel, or beer caramel (Class III): E150c, may contain ammonium compounds; used in beer, soy sauce, and confectionery.
Sulphite ammonia caramel, acid-proof caramel, or soft-drink caramel (Class IV): E150d, may also contain both ammonium and sulphite compounds; used in acid environments such as soft drinks
http://www.nationmaster.com/encyclopedia/Caustic-sulfite-caramel
/mattias
