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Which of the following causes a grayish build-up on the hair?

  1. Gradual color

  2. Highlighting

  3. Permanent color

  4. Temporary color

The correct answer is: Gradual color

Gradual color is the only option that specifically mentions a grayish build-up on the hair, indicating a gradual change in hair color that can result in a grayish tint. While highlighting, permanent color, and temporary color are all commonly used to change hair color, they are not known to cause a grayish build-up on the hair. Therefore, they are incorrect options.