Question 1

What is the primary difference between a temporary and semi-permanent hair color?

Accepted Answer

Temporary color deposits pigment on the outside of the cuticle and washes out after one shampoo. Semi-permanent color uses small dye molecules that partially penetrate the cuticle layer, lasting 4–6 shampoos without peroxide or ammonia.

Question 2

What volume of hydrogen peroxide developer is used to achieve maximum lift when lightening hair?

Accepted Answer

40 volume (12%) hydrogen peroxide provides maximum lift in permanent hair color and lightener applications. It releases the most oxygen and removes the most natural pigment, but also causes the most damage to the hair structure.

Question 3

A client has previously colored her hair red. She now wants platinum blonde. What must the cosmetologist explain?

Accepted Answer

Artificial red pigment molecules are large and bond tightly to the cortex. To achieve platinum from red, the artificial color must be removed (color remover or bleach) before lightening. Skipping this step results in orange or muddy tones.

Question 4

What is the patch test for hair color designed to detect?

Accepted Answer

The patch test (skin allergy test) is performed 24–48 hours before any oxidative color service to detect allergic contact dermatitis to PPD and related chemicals. An allergic reaction contraindicates the service.

Question 5

When mixing a permanent hair color, what is the standard mixing ratio of color to developer?

Accepted Answer

The standard mixing ratio for most permanent hair colors is 1:1 — one part color to one part developer. Some high-lift colors use a 1:2 ratio. Always follow the manufacturer's instructions as ratios affect color development.

Question 6

What is the purpose of adding heat during a chemical relaxer service?

Accepted Answer

Heat should not be applied during a chemical relaxer service. Chemical relaxers process through chemical reaction at room temperature; adding heat can cause over-processing, scalp burns, and severe hair breakage.

Question 7

What is the pH range of most permanent hair color developers?

Accepted Answer

Permanent hair color developers (hydrogen peroxide) have an alkaline pH of 9–11, which opens the cuticle, allows the dye to penetrate the cortex, and activates oxidation. High pH is necessary for permanent color but can damage the hair if overused.

Question 8

A client's hair turns orange when attempting to lighten dark brown hair. This is because:

Accepted Answer

Natural dark hair contains eumelanin (brown/black) and pheomelanin (red/yellow). As hydrogen peroxide breaks down melanin, hair progresses through a predictable series: black → brown → red → orange → yellow → pale yellow. Orange indicates partial melanin removal — more processing is needed.

Question 9

Which developer volume is most commonly used for deposit-only color with no lift?

Accepted Answer

10 volume (3% hydrogen peroxide) is used for deposit-only color — darkening the hair, toning, or covering gray without lifting the natural base. 20 volume lifts 1–2 levels; 30 volume lifts 2–3 levels; 40 volume is for maximum lift (bleach or high-lift tints).

Question 10

A cosmetologist applies a toner to freshly bleached hair. What is the purpose of a toner?

Accepted Answer

A toner is a semi-permanent or demi-permanent color applied after bleaching to neutralize or refine the underlying warm tones (yellow, orange). For example, a violet toner neutralizes yellow on pre-lightened blonde hair using color wheel opposites.

Hair Color and Chemical Services Practice Questions

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