A definitive guide to professional hair color terminology.
A highlighting technique using a blow dryer to push shorter hairs away from the section to be lightened, ensuring a seamless blend without backcombing.
An alkaline gas used in permanent hair color to open the hair cuticle and allow color molecules to penetrate. It has a distinctive smell and enables permanent color change by lifting natural pigment.
A product mixed with bleach or color to start the oxidation process. Also known as developer or peroxide, it comes in various volumes (10, 20, 30, 40) that determine lifting power.
Delicate, micro-fine highlights created by taking very small sections of hair. They mimic the natural, dimensional hair color seen in children.
A French freehand coloring technique where color is painted onto the hair to create a graduated, natural-looking effect. Unlike foils, it creates softer, less uniform highlights with no harsh lines.
The dominant or natural underlying color of the hair before any chemical treatment. Also refers to the all-over color applied to the roots or entire head as a foundation.
A treatment product (like Olaplex or K18) that repairs and strengthens the disulfide bonds in hair that are broken during chemical services. Essential for maintaining hair integrity during lightening.
Unwanted warm, orange, or yellow tones that appear in lightened hair, typically caused by incomplete lifting of the hair's natural underlying pigment or color fading.
A deep cleaning treatment that removes mineral buildup (from hard water/chlorine) and product residue, essential before corrective color services.
A complex service that fixes unwanted hair color results, often requiring multiple sessions. This can include removing banding, fixing hot roots, or completely changing the tone.
The critical conversation before a service where you assess the client's hair history, integrity, and goals to create a realistic plan.
Hair colors with blue, violet, green, or ash undertones. These tones neutralize warmth and are often used to counteract brassiness in blonde or brown hair.
The outermost layer of the hair shaft, made of overlapping scales. When the cuticle is open (via ammonia or heat), color can penetrate; when closed, hair appears shiny and smooth.
A technique that blends multiple shades (typically 3 or more) seamlessly together from roots to ends without harsh lines of demarcation.
Excess hair color mixed but not used during a service, representing lost revenue and environmental impact.
A deposit-only color that lasts 12-24 shampoos. It uses a low-volume developer and does not lift the natural hair color, making it ideal for toning, blending grays, or refreshing faded color.
An oxidizing agent (hydrogen peroxide) mixed with permanent or demi-permanent color to activate the chemical process. Common volumes are 10 (deposit), 20 (1-2 levels lift), 30 (2-3 levels), and 40 (3-4 levels lift).
The depth and movement in hair color created by using multiple shades or techniques (like highlights and lowlights) rather than a single flat, all-over color.
A two-step service: first decolorizing (bleaching) the hair, then applying a toner or color to achieve the final shade. Necessary for platinum blondes.
Massaging color or lightener through the hair (often at the shampoo bowl) to loosen product, ensure even distribution, and prevent scalp staining.
A deposit-only color applied to pre-lightened hair before going darker (tint back) to replace missing underlying pigment and prevent muddy results.
A hybrid technique combining the hand-painted application of balayage with the incubation and lifting power of foils for brighter, blended results.
Aluminum sheets used to isolate sections of hair during highlighting or lowlighting. Foils trap heat and accelerate processing, creating more defined results than open-air techniques.
A highlighting service where foils or balayage are placed throughout the entire head, from the crown to the nape, for maximum brightness and dimension.
A conditioning treatment that adds shine and can deposit subtle color. Also known as a glaze, it smooths the cuticle, enhances tone, and extends the life of existing color.
The process of coloring gray or white hair. Resistant grays often require higher developer, longer processing, or specialized formulas to ensure even, long-lasting coverage.
A permanent color designed to lighten hair up to 4-5 levels in a single step while depositing tone. It requires 40 volume developer and works best on virgin or naturally light hair.
Roots that process faster and lighter than the rest of the hair, often appearing orange or overly warm. Caused by body heat at the scalp accelerating the chemical reaction.
A structural protein naturally found in hair. Keratin treatments smooth the cuticle, reduce frizz, and improve manageability.
A universal numbering system (1-10) used to measure hair's lightness or darkness. Level 1 is black, Level 10 is lightest blonde. Essential for formulating accurate color results.
The process of lightening hair by dissolving natural pigment with bleach or high-lift color. Measured in levels (1-10).
A product (bleach or powder lightener) used to remove natural or artificial pigment from the hair. It opens the cuticle and disperses melanin, enabling significant lift.
Darker strands woven into lighter hair to add depth, contrast, and dimension. The opposite of highlights, lowlights prevent hair from looking flat or overly processed.
A low-maintenance hair coloring technique designed to look natural as it grows out, often featuring blended roots and multidimensional tones.
The natural pigment in hair that determines its color. Eumelanin creates brown and black tones; pheomelanin creates red and yellow tones. Lightening disperses melanin.
Bright, face-framing highlights (or lowlights) that add dimension and draw attention to the face. A signature statement that's lower maintenance than full highlights.
Using a complementary color (opposite on the color wheel) to cancel out unwanted tones. E.g., purple neutralizes yellow.
A graduated color technique where the hair transitions from dark at the roots to light at the ends (or vice versa). The transition is more distinct than in sombré or balayage.
The chemical reaction that occurs when developer is mixed with color or lightener. Oxygen is released, which opens the cuticle and allows pigment to penetrate or be removed.
Applying a small amount of product behind the ear or on the inner elbow 24-48 hours before a service to check for allergic reactions.
Hair color that uses ammonia and developer to lift natural pigment and deposit artificial pigment inside the cortex. It lasts until the hair grows out or is cut.
How easily hair absorbs and retains moisture and color. Low porosity hair resists absorption (cuticle is tight); high porosity absorbs quickly but fades fast (damaged cuticle).
An additional fee added to a service to cover the specific cost of color and supplies used.
The process of bleaching or lifting hair before applying a target color. Required when the desired shade is lighter than the current level or to create a clean canvas for vibrant tones.
The band of natural hair color visible at the roots after hair grows out between color appointments. Also called 'new growth' or 'root shadow.'
A technique where a darker color is applied to the root area and blended down into the mid-lengths for a seamless, 'lived-in' look. Often used to soften foil lines.
A no-ammonia, no-developer color that coats the outside of the hair shaft. It lasts 4-12 shampoos and is ideal for adding shine, refreshing tone, or experimenting with color.
A controlled, intentional dark root area that melts into lighter lengths. Similar to root smudge but often deeper and designed for very low maintenance grow-out.
An all-over color service done in one step, typically applying permanent or demi-permanent color from roots to ends. Used for full coverage, gray blending, or all-over tone change.
Applying color or lightener to a small, hidden section of hair to preview the results and check hair integrity before the full service.
A technique where hair is backcombed (teased) at the root before being foiled, creating a soft, diffused blend without harsh lines.
A demi-permanent or semi-permanent color applied to pre-lightened hair to neutralize unwanted undertones (brassiness) or deposit a specific shade. The final step in most blonde services.
The warmth or coolness of a hair color, separate from its level. Tone is described using letters (N=neutral, A=ash, G=gold, R=red, V=violet) and determines the final visual result.
The warm pigment exposed when hair is lifted. At level 7, underlying pigment is orange; at level 9, it's yellow. Understanding this helps predict and neutralize unwanted warmth.
Hair that has never been chemically treated with color, bleach, relaxers, or perms. Virgin hair lifts more predictably and is easier to formulate for than previously processed hair.
The strength of hydrogen peroxide in developer, measured in volumes (10, 20, 30, 40). Higher volume means more lift but also more damage. Also refers to the fullness of hair.
Hair colors with red, orange, gold, or copper undertones. Warm tones add richness and movement but can become unwanted brass if not properly balanced or maintained.
A foiling technique where small sections are selected by weaving a tail comb through a larger section of hair. Creates fine, natural-looking highlights throughout the head.
Applying different toner formulas to different areas (roots, mids, ends) to create a seamless gradient and address varying porosity.
