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Why is a colour retouch necessary?

  1. To enhance hair shine

  2. To apply hair color to new growth

  3. To change the hair color completely

  4. To strengthen the hair

The correct answer is: To apply hair color to new growth

A color retouch is necessary to maintain a consistent hair color and eliminate noticeable regrowth of new hair growth. Option A is incorrect because enhancing hair shine is not the main purpose of a color retouch. Option C is incorrect because changing the hair color completely is better achieved through a full hair color application, not just a retouch. Option D is incorrect because strengthening hair is not the primary purpose of a color retouch.