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When tinting lightened hair back to its natural shade, it is necessary to add what?

  1. A filler

  2. Bleach

  3. More shampoo

  4. Water

The correct answer is: A filler

When tinting lightened hair back to its natural shade, a filler must be added to ensure the hair maintains an even color and does not end up looking dull or flat. This is because lightened hair often lacks pigment, making it difficult for the color to adhere evenly. Adding a filler helps to restore some of this lost pigment and allows the desired color to properly bond with the hair. Choosing options B, C, or D would not effectively address this issue and may result in an uneven or unnatural-looking hair color.