Hair Colouring Theory and Application Flashcards

What is a double-process colour service?

Answer: A two-step service involving lightening the hair first then toning to the desired shade

A double-process colour involves two separate chemical steps: first, the hair is lightened (bleached) to the required level, then a toner or colour is applied to achieve the desired final shade. It is used when more than 4 levels of lift are needed.

What is the colour wheel relationship between violet and yellow?

Answer: They are complementary (opposite) colours

Violet and yellow are complementary colours, positioned directly opposite each other on the colour wheel. Violet toners are used to neutralize unwanted yellow tones in lightened or grey hair.

What does the term 'tone' refer to in hair colour?

Answer: The warmth or coolness of a colour, described as the hue

Tone (or hue) refers to the warmth or coolness of a hair colour — whether it is ash (cool), neutral, or warm (gold, copper, red). It is separate from the level (lightness/darkness).

What is the purpose of a colour remover or colour stripper?

Answer: To break down and remove artificial colour molecules from the hair

A colour remover or stripper is a product that shrinks or breaks down artificial colour molecules in the cortex so they can be washed out. It is used in colour correction to remove unwanted permanent or demi-permanent colour.

What is balayage?

Answer: A freehand painting technique where colour is swept onto the hair surface for a natural, sun-kissed effect

Balayage is a French freehand colouring technique where lightener or colour is painted directly onto the hair surface without foils. It creates a soft, graduated, natural-looking highlighted effect.

How long should a patch test be monitored before proceeding with a colour service?

Answer: 24 to 48 hours

A patch test should be monitored for 24 to 48 hours before the colour service. Allergic reactions can take time to develop, and a full observation period is necessary to ensure the client does not have a sensitivity.