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My daughter was trying to make tomato sauce for the first time. The recipe didn't mention anything about getting the air bubbles out. There is also a small amount of separation at the bottom. Since this is for 4H, is it advisable to reheat the product, reheat the jars & lids and re-process the sauce?
Are there large air bubbles visible? Yes, you can open, bring back to a boil, jar and reprocess with new lids. I've forgotten to run a knife into the jar to release any air bubbles, but there were not any adverse effects. The jars remained sealed and were OK to use. A little separation is normal for tomato sauce, if the sauce is not cooked to a very very thick consistency. For a 4-H project, air bubbles could reduce her score for the project. Recipes usually do not specifically mention the release of air bubbles on each recipe. It's standard procedure mentioned in the "canning specs" paragraph of the book or phamplet.
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