You can scrape surface mold off of home-canned jams and they will be safe to eat
November 25, 2011
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If you have anything growing on the surface of your homemade jarred jam, it’s a sure sign that the canning process did not work to sterilize the contents of the jar. You may think you can scrape it off and eat the clean-looking jam or jelly underneath, but that’s taking a chance. Molds often produce invisible, microscopic filaments that penetrate into the food and will remain behind when you scrape the visible mold away. These filaments can contain toxins that cause illness. Not worth the chance, in my opinion.