As a subject matter expert in the field of food science, I can tell you that Skittles, like many candies, are designed to be resistant to dissolving quickly in water. This is because they are primarily composed of sugar, which is a well-known desiccant and helps to keep the candy intact. However, Skittles do contain some water-soluble components, such as the corn syrup and various flavorings, which can dissolve in water. Over time, if you were to leave Skittles in water, they would eventually begin to dissolve, but the process would be quite slow compared to other candies that are not as sugar-rich.
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