4.1 Client Consultation, Hair & Scalp Analysis & Preliminary Tests
Key Takeaways
- Professional hair analysis rests on four measurable qualities — texture, density, porosity and elasticity — each of which changes the product, processing time and technique you select.
- A predisposition (patch) test screens for allergic sensitivity to aniline derivative tints and is applied 24 to 48 hours before the service behind the ear or on the inner elbow.
- A strand test is a different test with a different purpose: it previews the actual color, curl or straightening result and confirms processing time on a small section of the client’s own hair.
- WAC 308-20-110(1)(e) requires a Washington licensee to refuse or discontinue service on a client with visible open sores, inflamed skin, rash, or parasitic infestations.
- Client records document formulations, processing times, results, patch test dates and stated contraindications, which supports both service consistency and the licensee’s defense if a claim arises.
4.1 Client Consultation, Hair & Scalp Analysis & Preliminary Tests
The NIC content outline places client consultation, analysis and documentation at the head of the Hair Care and Services domain — the single largest domain on the written examination. That placement is deliberate: analysis determines the formulation, the timing and whether the service should happen at all.
The Consultation Sequence
A professional consultation is a structured interview, not small talk. Work it in order:
- Review the record. For a returning client, read the service card before you touch the hair — previous formulations, developer volumes, processing times, and any noted sensitivity.
- Establish the client’s goal in their words, then translate it into technical terms. "Beachy" and "ash" mean different things to different people; photographs reduce ambiguity.
- Analyze the hair and scalp under good light, on dry hair for texture and density and with a wet or tensioned strand for porosity and elasticity.
- Screen for contraindications — medical, chemical and regulatory.
- Recommend the service and the home-care products that maintain it, explaining why each is indicated for this client’s hair rather than reciting a product line.
- Confirm scope, time and price before the cape goes on.
- Document the agreement and the result.
The Four Analysis Qualities
| Quality | What it measures | How you assess it | Why it changes the service |
|---|---|---|---|
| Texture | Diameter of the individual hair strand — fine, medium or coarse | Roll a single dry strand between fingers; compare against a known medium strand | Fine hair processes fastest and is most easily damaged; coarse hair resists penetration and may need longer processing or a stronger formulation |
| Density | Number of hairs per square inch on the scalp — low, medium or high | Part the dry hair in several areas and observe scalp visibility | Governs sectioning size, product quantity, and how much weight a cut can carry |
| Porosity | The cuticle’s ability to absorb moisture and chemicals | Slide fingers from ends toward scalp on a strand; roughness indicates raised cuticle | The single biggest driver of color result and timing — porous hair grabs and fades; resistant hair needs more time or a stronger alkaline agent |
| Elasticity | The hair’s ability to stretch and return | Stretch a wet strand; healthy wet hair stretches about 50% of its length and returns without breaking | Low elasticity signals compromised bonds — a contraindication for aggressive chemical services |
Porosity deserves extra attention. Porosity is not damage per se; it is cuticle behaviour. Low-porosity (resistant) hair has a tightly packed cuticle that repels product. High-porosity hair — from prior lightening, relaxing, heat, or environmental exposure — absorbs quickly and unevenly, which is why fillers are used to equalize porosity before tinting back over previously lightened hair.
Scalp Evaluation and Contraindications
Separate the scalp assessment from the hair assessment. You are looking for redness, flaking, scaling, papules, pustules, weeping or crusted lesions, abrasions from scratching, and any sign of parasitic infestation.
Washington makes the outcome of that assessment a legal duty rather than a judgment call. WAC 308-20-110(1)(e) provides that a licensee must not perform or continue services on a client with visible open sores, inflamed skin, rash, or parasitic infestations. The obligation runs the other way too: WAC 308-20-110(1)(f) bars a licensee who knowingly has open sores, or who is exhibiting symptoms of an infectious or contagious disease, a skin disorder, or a parasitic infestation, from providing services. If either has occurred, the rule requires the service area and every implement or piece of equipment that could have been touched — including the work and waiting areas — to be cleaned and disinfected.
How to decline well: state the observation neutrally and without diagnosing ("I’m seeing irritation along this section that I’m not able to work over today"), refer the client to a physician, and offer to rebook. A cosmetology license does not authorize diagnosis or treatment of a disease.
Other contraindications that commonly stop or modify a chemical service:
- Chemical incompatibility — the classic case is metallic or compound dye already on the hair, which reacts violently with peroxide.
- Hydroxide relaxer history followed by a request for a thio perm, or the reverse. These chemistries are incompatible and the result is breakage.
- Failed elasticity test — hair that does not return after stretching wet.
- Recently reported medical or medication change that affects the scalp.
Two Different Preliminary Tests
Candidates routinely confuse these, and the NIC outline lists both explicitly.
Predisposition test (patch test). Purpose: screen for allergic sensitivity to aniline derivative tints. Method: apply a small amount of the tint mixed as for use to a clean area behind the ear or on the inner bend of the elbow, leave it undisturbed, and read it 24 to 48 hours later. A negative result shows no reaction. A positive result — redness, swelling, itching or burning — means the service must not be performed. Patch tests are for allergy, and they say nothing about the color outcome.
Strand test. Purpose: preview the actual result and confirm processing time. Method: apply the formulation to a small, hidden section of the client’s own hair, process, then check at intervals. A strand test is what tells you the timing for this client’s porosity, whether the target level is achievable in one process, and whether the tone lands where you expect. Strand testing is equally standard before relaxers (to confirm the hair can take the service and how long it needs) and before perms (the preliminary test curl).
One useful memory hook: patch = person (will the client react?), strand = strand (what will the hair do?).
Client Records
A record card is a technical and a defensive document. Capture:
- Date, service performed, and the operator’s name.
- Exact formulation — product, level, tone, developer volume, ratio, quantity.
- Processing time and application sequence (virgin versus retouch, where you started).
- Analysis findings — texture, density, porosity, elasticity, scalp condition.
- Patch test date and result, and any refusal of a test.
- Result achieved and the client’s stated reaction.
- Home-care products recommended and purchased.
- Stated allergies, medications and prior chemical history, including services performed elsewhere.
Good records make the next appointment reproducible, let a colleague cover for you, and give you contemporaneous evidence of what was applied and what the client disclosed. Store them so that client information stays confidential.
A colorist applies a small amount of an aniline derivative tint behind the client’s ear and asks the client to return in 24 to 48 hours without disturbing the area. What is being tested?
Which analysis quality is assessed by stretching a wet strand of hair, and what does healthy hair do?
During a consultation a Washington cosmetologist observes an inflamed, weeping rash across the client’s scalp. What does WAC 308-20-110 require?