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I am preparing prune plums for drying and want to keep them from discoloring.
From Teresa Marrone's "The Beginner's Guide to Making and Using Dried Foods" -
"plums need no pre-treatment."
The standard range, per quart of water, is 1 to 3 teaspoons of citric acid. Since they supposedly don't need it at all, I'd lean towards the lower end, if you want to use it anyway.
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