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Canning -- Miscellaneous
What causes color changes in home canned foods?
Color changes typically result from the following: how the produce is handled between harvesting and canning; growing conditions for a particular season; overcooking or heating at too high a temperature; improper storage conditions; low sugar content in a recipe; quality of water used in recipe preparation, or a reaction with the type of utensil used for cooking. Following a reliable canning guide such as the Ball Blue Book Guide to Home Canning, Freezing & Dehydration will give detailed information on how to avoid color changes in home canned foods. Source: Original FAQ posted at http://www.homecanning.com/usa/alfaq.asp