Chemical services should not be performed on hair that has been colored with any of the following products EXCEPT:

Chemical services should not be performed on hair that has been colored with any of the following products EXCEPT:

• A. Henna
• B. Metallic dyes
• C. Compound dyes
• D. Weekly rinses

Answer: (D)

When planning chemical services, hair must be free of substances that can react with developers or lighteners. Henna deposits a natural dye in the hair that can behave unpredictably when oxidizers are used, potentially shifting color or creating uneven results. Metallic dyes contain metal salts that can react with chemical processing, leading to damage, breakage, or unpredictable outcomes. Compound dyes are formulations that can also interact with chemical services in unforeseen ways, causing inconsistent results. Weekly rinses are temporary color rinses that wash out over time and do not leave lasting chemical residues, so they don’t impede chemical services once fully removed. That makes weekly rinses the safe exception among these options.

When planning chemical services, hair must be free of substances that can react with developers or lighteners. Henna deposits a natural dye in the hair that can behave unpredictably when oxidizers are used, potentially shifting color or creating uneven results. Metallic dyes contain metal salts that can react with chemical processing, leading to damage, breakage, or unpredictable outcomes. Compound dyes are formulations that can also interact with chemical services in unforeseen ways, causing inconsistent results. Weekly rinses are temporary color rinses that wash out over time and do not leave lasting chemical residues, so they don’t impede chemical services once fully removed. That makes weekly rinses the safe exception among these options.