Practice Test Geeks(CHS) Certified Hair Stylist Practice Test
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Chemical Services & Safety Flashcards

7 cards from real CHS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Chemical Services & Safety flashcards as text

  1. Which developer volume is typically used when mixing a permanent hair color to deposit and lift simultaneously?

    Answer: 20 volume (6%)

    20 volume developer provides the standard lift-and-deposit action for permanent color, opening the cuticle moderately while activating dye intermediates.

  2. What is the chemical process that causes oxidative hair color to permanently change hair's natural pigment?

    Answer: Melanin is oxidized and artificial color polymers form inside the cortex

    Peroxide oxidizes melanin to lighten it while also polymerizing small dye intermediates inside the cortex to form large, permanent color molecules.

  3. A client wants to go from dark brown to light blonde in one session. What chemical service hazard must the stylist discuss?

    Answer: Severe damage or breakage from high-lift processing

    Removing multiple levels of dark pigment requires aggressive bleaching that can compromise the hair's structural integrity, leading to breakage.

  4. What does the term 'on-scalp bleach' mean in professional hair services?

    Answer: A lightener formulated to be applied directly to the scalp and roots

    On-scalp bleaches contain gentler ingredients and are formulated to be safe when applied at the root area touching the scalp.

  5. Which ingredient in hair color is primarily responsible for opening the cuticle to allow dye penetration?

    Answer: Ammonia

    Ammonia raises the pH of the color mixture, swelling and opening the cuticle scales so that color intermediates can enter the cortex.

  6. A client's allergy patch test returns positive (redness, swelling at test site). What is the correct course of action?

    Answer: Do not perform the chemical color service

    A positive patch test indicates an allergic sensitivity; proceeding with any oxidative color service risks a severe systemic allergic reaction.

  7. What is the function of a color filler before tinting previously bleached hair?

    Answer: To restore missing warm pigment tones so the final color applies evenly

    A filler deposits missing primary color pigment into over-lightened hair so the final tint grabs evenly without going ashy or uneven.