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Mustaches and beards should never be colored with:

  1. Henna

  2. Vegetable Dye

  3. Aniline Derivative Tint

  4. Lead Acetate

The correct answer is: Aniline Derivative Tint

Not all colors or dyes are safe for facial hair. While options A and B may be natural and relatively safe, aniline derivative tint (option C) is a type of synthetic dye that can irritate the skin and cause allergic reactions. Option D, lead acetate, is a toxic chemical that can be harmful if accidentally ingested. When it comes to coloring facial hair, it's important to research and choose a safe and non-toxic option.