Fillers are used to

• A. Replace missing primary color
• B. Lighten hair
• C. Tone the hair
• D. Remove buildup

Answer: (A)

Fillers replenish the underlying pigments that are often stripped away when hair is lightened, creating an even base for the color to deposit. After lift, hair can have uneven porosity and missing primary color molecules, which causes some strands to take color differently than others. By introducing the appropriate primary pigments back into the hair, a filler helps balance the base so the final shade deposits evenly and predictably. It’s not about lightening, toning, or removing buildup, but about preparing the hair so the color system can work evenly across all strands. For example, after lifting to a pale base, a filler ensures the subsequent color sits evenly rather than shifting due to uneven underlying tones.