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It is fine to reboil theIt is fine to reboil the marmalade. You may not even have to add any more pectin or sugar. Marmalade needs a long slow simmer. Just boil it until a quick test (put a few drops of the marmalade on a plate to cool to see if it thickens) comes out OK.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?