What is a color filler used for in color services?

• A. A filler helps equalize porosity and base tone before color deposition to achieve uniform results
• B. A filler adds shine without changing color
• C. A filler permanently straightens hair
• D. A filler changes hair texture to be more coarse

Answer: (A)

In color services, a color filler is used to even out differences in porosity and base tone across the hair before applying color. When hair has varying porosity—often from previous chemical processing or natural variation—some sections grab pigment more than others, leading to patchy or uneven color. Filling those porosity gaps with a color filler creates a more uniform canvas, so the new color deposits evenly from roots to ends and reads true to the chosen shade. It also helps balance underlying tones so the final result isn’t distorted by unwanted undertones. This function is distinct from adding shine, relaxing or changing texture, which is why the other options don’t fit.