Texas Cosmetology Operator Written ExamHair Care ServicesHard
A cosmetologist is performing a hair coloring service on a client who previously had her hair colored with metallic dyes. What is the primary concern and potential risk when applying oxidative hair color over hair treated with metallic dyes?
- AThe new color will not penetrate the hair shaft.
- BA severe chemical reaction, discoloration, or hair breakage may occur.
- CThe hair will appear dull and lifeless after coloring.
- DThe metallic dyes will cause the hair to become overly porous.
Show answer & explanationAnswer & explanation
Correct answer: B. A severe chemical reaction, discoloration, or hair breakage may occur.
Metallic dyes contain metal salts that can react severely with the hydrogen peroxide in oxidative (permanent or demi-permanent) hair colors, leading to extreme heat, chemical burns, or severe hair damage and unpredictable discoloration.
Why the other options are wrong
- A. While penetration can be affected, the primary and most dangerous concern is a chemical reaction.
- C. Dullness is a possible negative outcome, but it is secondary to the more severe risks of chemical reaction and damage.
- D. Metallic dyes can make hair feel coated, but the main issue isn't increased porosity, it's the dangerous chemical interaction.
Metallic Dyes & Oxidative Color
Applying oxidative hair color over hair previously treated with metallic dyes can cause a dangerous chemical reaction due to the interaction of metallic salts with hydrogen peroxide.
- Metallic dyes are progressive, building up color with each application.
- Contain lead, silver, copper, which react with peroxide.
- Always perform a strand test and metallic salt test before applying oxidative color.
Memory trick: METALLIC + OXIDATIVE = MELTDOWN!