As Elizabeth said, the ones in the PC and BWB are equivilent processing times. Folks don't normally want to PC tomatoes for a longer time. It is based on the "general" public. It is easier and faster to just add the acid. It would take a long time for the heat to penetrate the tomatoes in the pressure canner that most people would not want to do that. All the commercial tomatoes have citric acid added.Fruit fresh is only for color preservation, not for adding acidity. Do not use it instead. It must be citric acid or bottled lemon juice. The Minnesota guidelines are not safe to rely upon for tomatoes. One thing, most of us are not in Minnesota. Secondly, this is their own independent study. This is not the USDA standard testing.( The National Center For Home Food Preservation are the ones to rely upon. They are the leading authority when it comes to canning. Elizabeth Andress wrote the USDA guidelines.) Our soil will be different than theirs. If you grow the same tomatoes in your garden and I grow them in mine they ph level can be totally different. The canning times for the other veggies are based not only on ph, but density. It depends upon how the cells of the veggies absorb the heat in the pressure canner. Denser things take longer to process. For example, green beans in water will heat faster than a jar full of just packed tomatoes. Same reason the zucchini and tomato mixture is processed with no acid added. The juice from the tomatoes, the way they are diced, etc. all make a difference in heat penetration . Same reason tomato juice doesn't take as long to process as whole tomatoes. The juice is thinner and less dense. So, that is most of the reason behind tomatoes taking so long. We find that the crushed tomatoes result in the best texture, faster times, etc. There is a comparable time, but that is for tomatoes packed in water. Who wants to fill their jars full of water with tomatoes ??? If you raw pack them, then it does take 85 min. in the BWB canner. So, when we teach canning lessons we have them do the crushed tomato version from the NCFHFP. You crush and heat some of the tomatoes first, then keep adding the rest of the tomatoes to the pan and heat them all. The PC is supposed to have a higher nutrition value than the BWB canned tomatoes. If you think them too tart, some folks add a pinch of sugar. I don't even notice the tartness of the added acid to tomatoes. I hope I answered everything. If not, then ask me again. Things are CRAZY around here now ! Oh, and the thing about boiling them first before you eat them. Well, if botulism is there, think about you opening that jar, touching the lid with botulism on it. Then, maybe dripping it on the counter. Just not really that wise to use boiling as insurance in my personal opinion. Either you processed them correctly and they are safe or they are not safe. So, I suggest do it correctly and no risk involved.

I have canning directions from a number of universities, Ball, Kerr, Presto, etc., dating back for over 20 years to the present. There have been many changes to the recommendations given by the various sources over the years. Example: pressure canning tomato juice in "Presto Cooker Canner, Directions and Recipes, 1978" lists no requirement for adding lemon juice or other acidification, and a recommended processing time for both pints and quarts is given as 15 lbs - 0 minutes. We've used that recipe over the years with no problems, but have since changed to other processing methods (processing time, acidification, pounds of pressure). It was only until a few years ago that we could find an "approved" method for preparing and canning vegetable tomato juice (V8?), but we've been canning quarts and 1/2 gallon jars of our own "V8", using our own directions which I've published here a number of years ago, for over 30 years! Jeez, did I get the nasty comments after posting that. And, the person that posted that the large canneries monitor the temperatures of each container in a batch, and conduct lab tests on products from each batch has certainly observed canneries other than the 10 or so I've visited. Getting back to recipes for half gallon jar recipes, I know it would be no big deal for a University that routinely conducts food safety testing and publishes "safe" recipes to conduct tests and provide recommendations for canning at least a limited number of recipes they standardize as to type and amount of each ingredient, etc. Heck, I can't believe that a great number of grad students haven't wanted to do just that!

Linda that's great. Much respect for your work! Looks like it had good impact on your community. There is so much food waste, money spent on bad food like candy, chips and soda, and it's so easy to grow a garden. You have given me an idea, I may contact my extension office and ask if they have classes like that here. I have wanted to take such a class for some time, but didn't know the county might have them. Food preservation is a science, and although I have the books, I would rather see someone else do it than read from a book, in case the book has a printing error or leaves something out. I didn't dare to try to can till after watching some youtube videos. So you see the classes really help as I'm sure there are other people like me who need more than a book to get started.

You can find it at tons of places online...wholesalesupplies plus, etc. Purpose in real life is as a fruit preseritive-keeps fresh fruit from browning etc. Also used on the outside of things like sour babies to give them their sour taste. In bath fizzies, when it is combined with baking soda it causes a chemical reaction which causes the fizzing. If nothing else, do a google search for citric acid, you should get a bunch of places that carries it. Bitter creek candle supply may have it, Lavender lane, & cranberry lane both carry it. Hazel