Final answer:
Cross-dye is the least colorfast dye method, while Indigo dye exemplifies colorfastness.
Explanation:
Cross-dye is the type of dye method that is the least colorfast. Colorfastness of a dye refers to its ability to retain color when exposed to factors like washing and light. For example, in the passage, Indigo dye is highlighted for its colorfast properties, indicating its resistance to fading.
Learn more about Dye methods and colorfastness here:
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