Mhays wrote:Was canning salsa (the Ball website has a recipe I liked) and lost a jar, myself. Annoying how they explode into your water bath.
Hi,
There can be many reasons for a jar breaking, which I agree is not a very happy moment. I have heard the telltake crack noise when I put a jar into a canner, too. Fortunately, it has been a few years (crossing my fingers).
One issue is thermal shock. If a jar is hot packed, it can be introduced into a water bath or pressure canner with water heated to 180 degrees F. If it is cold packed, then introduced at a temperture of 140 degrees F. To go hotter or cooler than these water temperatures is setting up conditions for thermal shock.
Another opportunity for thermal shock: take the jar out a canner and lay it on a cold hard surface. I put a towel down as a buffer. (On canning days, I go through dish towels are a very fast pace.)
When I visited Ball last year, they favored prewarming jars before filling. Except for sterlizing jars for jam, I never saw any prewarming jars via my favorite source: National Home Preservation website. I have not personally prewarmed a jar, largely because once you take it out to fill the jar is cooling rapidly. Once you have filled it, added lids and rings, the jar is the same temperature as contents (cold or hot). If I saw a reason to do it, I would but it seems an unnecessary ritual.
How jars are handled can be a source. You can learn a thing or two of what not to do from
my friend's experience.
Somedays you can do everything right and it still happens. It can simply be there was a crack not detected when you went to work. A quick cold-to-hot or hot-to-cold will cause a crack to pop. I carefully store my jars when they are done. I don't use them for drinking glasses or vases, I want to minimize handling and opportunities for cracking.
You know what peeves me? The people you gift with your jams. Instead of returning the jar, they toss it into the recycling bin. That is a senseless loss, too.
Regards,