Chemical services performed on overly porous hair require solutions that are

• A. Low pH
• B. High pH
• C. Neutral pH
• D. Very high pH

Answer: (A)

When hair is overly porous, the cuticle scales are lifted and the strands swell easily, so chemical services must be controlled to avoid overprocessing. Using acidic, low-pH solutions helps the cuticle lie flatter and reduces swelling, which slows chemical absorption and protects fragile, porous hair from further damage. High-pH solutions would lift the cuticle even more, increase swelling, and allow chemicals to penetrate too rapidly, risking severe damage or breakage. Neutral pH sits in between and may not offer enough control, while very high pH would be even more aggressive. So, a low-pH environment is the best choice to protect overly porous hair during chemical services.