Water bath canning creates a shelf-stable seal using heat. It is ONLY safe for high-acid foods: jams, jellies, pickles, tomatoes, and fruits. For low-acid foods (vegetables, meats) you need a pressure canner. Follow tested recipes exactly for safety.
What You Need
- Any high-acid canning recipe (jam, pickle, tomato sauce)
- Canning jars with new lids and rings
- Large pot with rack (or canning pot)
- Jar lifter, canning funnel, bubble remover
Method
- Wash jars in hot soapy water. Keep hot until use (no need to sterilize if processing 10+ min).
- Place new lids in simmering (not boiling) water to soften the seal. Keep warm.
- Prepare your recipe. Have everything ready before filling jars.
- Fill jars using a canning funnel, leaving specified headspace (usually ¼ inch for jam, ½ inch for most others).
- Remove air bubbles by running a thin spatula around the inside edge.
- Wipe jar rims with a clean damp cloth. Any residue will prevent sealing.
- Apply lids and rings — fingertip tight only, not forced.
- Lower jars into boiling water on a rack. Water must cover jars by 1–2 inches.
- Process for the time specified in your tested recipe. Start timing when water returns to a full boil.
- Remove jars without tilting. Leave undisturbed for 12–24 hours. Check seals — the center should not flex.
Tips & Notes
- Only use recipes from the USDA, Ball, or other validated sources. The acid/sugar/processing time combination is a safety system.
- Label everything with contents and date. Sealed jars last 1–2 years but are best in year one.
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