how do you know if home-canned tomatoes are bad ?

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https://www.cdc.gov/botulism/consumer.html

https://www.cdc.gov/botulism/consumer.html
Home-Canned Foods | Botulism | CDC
Before eating home-canned tomatoes, foods containing home-canned tomatoes, or any home-canned foods that are low in acid, boil in a saucepan, even if you detect no signs of spoilage. At altitudes below 1,000 feet, boil foods for 10 minutes. Add 1 minute for each additional 1,000 feet of elevation.
Botulism
When you seek medical care, be direct and honest with your medical providers. Tell them about any drugs you have used in the past two weeks and how you used them. It can be easy to mistake wound botulism for other, more common illnesses. Your doctor needs to know if you use injection drugs, so you can be diagnosed and treated quickly and correctly.

https://www.cdc.gov/foodsafety/communication/home-canning-and-botulism.html

https://www.cdc.gov/foodsafety/communication/home-canning-and-botulism.html
Home Canning and Botulism | CDC
5 juin 20231. Use proper canning techniques. The best way to prevent foodborne botulism is by carefully following instructions for safe home canning from the USDA Complete Guide to Home Canning. Only use recipes and cookbooks that follow the steps in the USDA guide. Don’t use other recipes, even if you got them from a trusted friend or family member. 2.

https://recipesfaqs.com / how-do-i-know-if-my-canned-tomatoes-are-bad

https://recipesfaqs.com / how-do-i-know-if-my-canned-tomatoes-are-bad
How do I know if my canned tomatoes are bad? – Recipes FAQs
24 juin 2022the container is leaking, bulging, or swollen; the container looks damaged, cracked, or abnormal; the container spurts liquid or foam when opened; or. the food is discolored, moldy, or smells bad. How can you tell if canned tomatoes have botulism? Swollen cans often indicate a spoiled product.

https://blogs.extension.iastate.edu/answerline/2021/08/10/canned-tomatoes-answers-to-frequently-asked-questions

https://blogs.extension.iastate.edu/answerline/2021/08/10/canned-tomatoes-answers-to-frequently-asked-questions
Canned Tomatoes – Answers to Frequently Asked Questions
Penn State Extension advises on the three likely causes of liquid loss or siphoning from the jar during processing of tomatoes or other fruits and vegetables—raw pack, rapid fluctuation of temperature in the canner, and removing the jars too quickly after processing.

https://housevivid.com/how-long-does-homemade-canned-tomatoes-last

https://housevivid.com/how-long-does-homemade-canned-tomatoes-last
How Long Does Homemade Canned Tomatoes Last? Insider’s Guide
Homemade canned tomatoes can last from 1 to 5 years. The shelf life depends on canning methods, sterilization, and seal quality. Store canned tomatoes in a cool, dark place. Recognize spoilage signs: discoloration, odd odor, and mold. Proper storage and care extend shelf life.

https://www.dummies.com/article/home-auto-hobbies/food-drink/canning/signs-of-spoiled-canned-food-201135

https://www.dummies.com/article/home-auto-hobbies/food-drink/canning/signs-of-spoiled-canned-food-201135
Signs of Spoiled Canned Food – dummies
To avoid making yourself sick with canned foods that have spoiled, watch out for these signs of a spoiled product: A bulging can or lid, or a broken seal. A can or lid that shows signs of corrosion. Food that has oozed or seeped under the jar’s lid. Gassiness, indicated by tiny bubbles moving upward in the jar (or bubbles visible when you …

https://www.mashed.com/274994/why-people-are-concerned-about-eating-canned-tomatoes

https://www.mashed.com/274994/why-people-are-concerned-about-eating-canned-tomatoes
Why People Are Concerned About Eating Canned Tomatoes
The CDC points out that botulism, a potentially deadly foodborne illness, is often caused by eating home-canned goods that haven’t been properly prepared. If, on the other hand, you get nervous about eating canned tomatoes of the store-bought kind, there’s really no need for fear. Nutritionist and chef Robin Miller spoke to us on the subject …

https://www.stilltasty.com/Fooditems/index/18531

https://www.stilltasty.com/Fooditems/index/18531
How Long Do Unopened Canned Tomatoes Last? – StillTasty
The best way is to smell and look at the canned tomatoes: if the canned tomatoes develop an off odor, flavor or appearance, or if mold appears, they should be discarded. Discard all canned tomatoes from cans or packages that are leaking, rusting, bulging or severely dented. About Our Authors

https://nchfp.uga.edu/how/general/identify_handle_spoiled_canned_food.html

https://nchfp.uga.edu/how/general/identify_handle_spoiled_canned_food.html
National Center for Home Food Preservation | How Do I? Can – UGA
Wash your hands with gloves thoroughly. Carefully add water to the pot and avoid splashing the water. The water should completely cover the containers with a minimum of a 1-inch level above the containers. Place a lid on the pot and heat the water to boiling. Boil 30 minutes to ensure detoxifying the food and all container components.

https://extension.umn.edu/preserving-and-preparing/canning-tomato-products-safety-guidelines

https://extension.umn.edu/preserving-and-preparing/canning-tomato-products-safety-guidelines
Canning tomato products – safety guidelines | UMN Extension
The canning process time may not be enough to kill disease organisms. This could lead to a product that spoils and is unsafe to eat. Add acid to all tomatoes before processing A high acid level (pH of 4.6 or less) prevents the growth of Clostridium botulinum bacteria which causes botulism. lesoutrali bot