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All of the following have insufficient structure to color EXCEPT?

  1. Gray hair

  2. Green cast

  3. Yellow hair

  4. White hair

The correct answer is: Gray hair

All of the other options are incorrect because they all mention a color or color cast associated with hair except for gray hair. Gray hair does not typically describe the color of the hair but rather the absence of color. Therefore, it does not have a "color structure" to color.