Lower the Ph of Your Jam for Canning

Introduction: Lower the Ph of Your Jam for Canning

About: I'm a Mum, an adventure guide, a radio tech, an avid inventor of cardboard box/toilet roll style fun, with the occasional grownup thing thrown in too.

If you want to Can your Jam for longer shelf life, you can either pressure can it. (Which requires special expensive equipment.) or you can make Jam with a Ph less than 4.6 and Boiling Water Bath Can it as described in Paige Russell'sCanning and Preserving Class.

So how do you make sure your Jam has a Ph of 4.6 or less?

Just add lemon.

You will need:

  • Jam making supplies
  • Lemon
  • Ph tester (digital or strips)
  • Canning supplies

Step 1: Add Lemon Juice

Lemons are highly acidic, adding lemon juice to your recipe lowers the Ph of the entire recipe.

As you are cooking your Jam add some Lemon juice to it.

How much Lemon juice depends on Ph level of your jam and how much you are making.

Squeezing the juice from half a lemon should be enough to lower the Ph of one jar of jam from 5 to 4, you will need to check it to ensure you don't get botulism.

Step 2: Test Ph

Make sure you completely stir the lemon juice into your jam mixture before you use either your digital tester or your strips to test the Ph.

Keep adding lemon juice until the Ph is 4.6 or lower.

If you have a digital tester you can be more exact, if you are using the strip tester you will have to add more lemon juice than is needed to ensure you are below 4.6.

Once your jam has a Ph of 4.6 or lower your jam is good to can.

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Canning and Pickling Challenge 2017

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    vishes kunwar
    vishes kunwar

    Question 2 years ago

    how does the control of ph levels for jam prevent food spoilage?


    Answer 2 years ago

    High acidity levels will prevent botulism "spores" from growing/developing into the deadly botulism toxin. Botulism spores will not germinate into the toxin unless in an oxygen-free environment with low acidity (above 4.6). Botulism spores are commonly found on fruits and vegetables (and seafood); which means these spores are probably in your jam and jellies. It is extremely important to control the pH of your jam - if you seal it properly (give it an oxygen-free environment) but do not lower the pH then the botulism spores are highly likely to develop into the botulism toxin.