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Canning -- Vegetables

Why do green beans appear to have a blistered surface after they have been canned?

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The major reason for blistering is holding the green beans too long between harvest and canning. The outer cells dehydrate and become more rigid. During heat processing, these cells separate, or split off, causing a blistered effect. If properly processed, they are safe.

PREPARED BY: Angela M. Fraser, Ph.D., Associate Professor/Food Safety Specialist, and Carolyn J. Lackey, Ph.D., R.D., L.D.N., Professor/Food and Nutrition Specialist, North Carolina State University (August 2004)

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