Skittles · Snacks
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The sour treatment applied to the gummy format, which means an acid coating on a soft sweet rather than on a hard shell. That's a harder thing to keep stable. A gummy carries far more moisture than a panned shell does, and acid in contact with moisture over time will start breaking down the gelatine, so a sour gummy has a shorter window in which it eats the way it was designed to. The acid is usually a mix rather than one ingredient, since citric acid gives an immediate sharpness and malic acid lasts longer, and the two together cover more of the mouthful than either does alone.
