Even coooked, sugar is always going to be hygroscopic. That means it'll take up water from wherever it can get it. If the peanuts you're using are fresh and unroasted, they have water in them, and the sugar is going to take that up and soften. You might try storing your brittle with a terra cotta disk (brown sugar softener) that HASN'T been soaked, or if you're comfortable with it, a silica gel packet wrapped in a paper towel. They'll both compete with the sugar for the available water, and may give your brittle a longer, crispy life. Susan

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