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| Are blackened jar lids a sign of spoilage? | to Top |
The deposit is due to a chemical reaction between the food and the lid. It is not harmful to consume but off-flavors may be present. This is most common with acid foods.
VanGarde, Shirley J. and Margy Woodburn. 1994. Food Preservation and Safety. Principles and Practice. Iowa State Press, Ames Iowa.,, p. 135
Updated: Saturday, December 29, 2007.
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