2026 Nov 12th
Why did my jam set on the plate but not in the jar?
The question
Making jam with pectin, didn't go as planned
I get asked this a lot here in Canada by home preservers.
You tested the foam, not the jam. Foam is the most concentrated part of the pot, and a tiny sample sets faster than a whole jar. Test a spoonful of the jam itself on a chilled plate. Reboil this batch to a full rolling boil for two minutes, then retest.
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Frequently Asked Questions
The following operator questions are answered with cited sources. Every FAQ links to the community thread, buyer guide, or regulator page it was researched from.
Why did my jam set on the plate but not in the jar?
You tested the foam, not the jam. Foam is the most concentrated part of the pot, and a tiny sample sets faster than a whole jar. Test a spoonful of the jam itself on a chilled plate. Reboil this batch to a full rolling boil for two minutes, then retest.
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