Hair Porosity Test: Free Quiz + What Cosmetic Chemists Say

Hair porosity

Hair Porosity Test

Eight quick questions about how your hair behaves with water and product. You will find out whether your porosity is low, medium or high, why, and exactly what that means for the products and routine that will work for you.

8 questions. No email needed. Nothing is saved.

What does a strand do in a glass of water?

It floats on top Still on the surface after a few minutes It hangs in the middle Slowly drifts down but does not reach the bottom It sinks to the bottom Goes down quickly, within a minute or two I have not tried it Skip it. The other questions will cover it

What happens when you spray water on dry hair?

It beads up Droplets sit on the surface or roll off It soaks in after a moment Sits briefly, then absorbs It disappears straight away The hair drinks it up on contact

How long does your hair take to air dry?

Most of the day Still damp in the middle hours later A couple of hours Roughly what I would expect Under an hour It is dry almost before I have finished styling

What happens when you put in a leave-in or cream?

It sits on top Feels greasy or coated, builds up, can flake It works in with a little rubbing Absorbs without leaving a film It vanishes and I need more My hair soaks up whatever I give it

How long does your hair stay moisturised?

Most of the week Once it is moisturised it stays that way Two or three days A quick refresh mid-week keeps it going Barely a day It feels dry again by the next morning

How does your hair respond to deep conditioning?

Not much, unless I use heat Needs a steamer, heat cap or a long time to do anything Well, and the results last Soft for days afterwards Instantly, but it fades fast Soft on the day, dry again soon after

How does a strand feel when you slide up it?

Smooth Slick, almost glassy Slightly textured A little drag here and there Rough or bumpy Catches all the way up

Has your hair been chemically treated?

Bleached, relaxed or permed Now or within the last year or so Coloured, or heat styled weekly Permanent dye, or straighteners and blow-dries most weeks None of these Virgin hair, or only the occasional blow-dry

The 3 hair porosity types

Scoring needs JavaScript. With it switched off you can still read all three porosity types below and match yourself by eye.

Your hair porosity

Low Porosity

Tightly closed cuticle

Your cuticle scales lie flat and overlap tightly. Water and product struggle to get in, but once moisture is inside, your hair holds onto it well.

This is why products seem to sit on top, why wash day takes a while to get your hair properly wet, and why buildup is your most common problem. Low porosity hair is usually healthy hair. It does not need heavier products, it needs lighter ones, a little warmth to lift the cuticle, and regular clarifying so there is a clean surface for moisture to get through.

Look for

Water-based leave-ins and light milks
Humectants like glycerin and aloe
Light oils: argan, grapeseed, jojoba
A clarifying shampoo every few weeks

Go easy on

Heavy butters and thick creams as a first layer
Frequent protein treatments
Layering several products on top of each other

How to look after it

Deep condition with heat. A warm towel, heat cap or hooded dryer for 15 to 20 minutes lifts the cuticle enough to let it in.
Apply products to damp, not dripping, hair, in small amounts. If it is still sitting on the surface after a minute, you have used too much.
Wash and rinse with warm water rather than cold.
Clarify every two to four weeks to clear the buildup that a closed cuticle collects.

Your hair porosity

Medium Porosity

Balanced cuticle

Your cuticle is slightly raised, enough to let moisture in easily and still tight enough to keep it there. This is often called normal porosity, and it is the easiest to work with.

Your hair takes colour, holds a style and responds to most products the way the label says it will. The job here is protecting what you have. Heat, colour and rough handling all push hair towards high porosity over time, so a light routine and a little prevention go further than any treatment.

Look for

Balanced moisturising conditioners
Medium-weight creams and leave-ins
A light protein treatment once a month
Heat protectant whenever you use tools

Go easy on

Overdoing protein, which can make hair stiff
High heat without protection
Harsh sulphate shampoos every wash

How to look after it

Deep condition every week or two, alternating moisture and the occasional protein mask.
Choose products by your curl pattern and density, not your porosity. You have the freedom to.
Keep heat tools on a medium setting and always use a protectant.
Trim the ends regularly. They are the oldest hair and the first to turn high porosity.

Your hair porosity

High Porosity

Open, raised cuticle

Your cuticle is lifted or has gaps in it. Water rushes in, which is why your hair wets and dries so fast, and it escapes just as quickly, which is why it feels dry again so soon.

High porosity is sometimes genetic, but it is usually the result of bleach, relaxers, heat or sun lifting the cuticle. The fix is a two-part routine: get moisture in, then seal it there with something heavier, and use protein to temporarily fill the gaps in the strand. Expect it to frizz in humidity until the damaged lengths grow out.

Look for

Protein treatments: keratin, amino acids, rice water
Rich creams, butters (shea, mango) and sealing oils
Leave-in conditioner on every wash
Anti-humectants in humid weather

Go easy on

More bleach, relaxer or high heat
Harsh sulphate shampoos
Glycerin-heavy products in high humidity

How to look after it

Layer with the LOC method: liquid or leave-in, then oil, then cream. Seal while hair is still damp.
Do a protein treatment every two to four weeks, followed by a moisturising deep conditioner.
Finish with a cool rinse to help the cuticle lie flatter.
Sleep on satin or silk and cut back on heat. Every pass of a hot tool lifts the cuticle further.

What Is Hair Porosity?

A hair porosity test measures how easily water gets into a strand and how long it stays. It all hinges on the cuticle, the thin outer layer of each hair. Flat and tight means low porosity. Lifted or chipped means high. The hair porosity guide covers each level.

Curly and coily hair is more likely to be porous, per a review by cosmetic scientist Dr. Amber Evans for the New York Society of Cosmetic Chemists (NYSCC). Even 4C hair can test low, though. The hair types chart only hints at porosity, and the hair type quiz reads both.

How to Test Hair Porosity at Home

A hair porosity test at home comes down to three checks, and all three are in the quiz above. The other five questions you can answer from memory. Each check works best right after a wash, before any leave-in goes on.

Test	How to do it	What it shows	What throws it off
Float test	Shed hairs in room-temperature water, 3 to 4 minutes	Floats: low. Middle: medium. Sinks: high	Oil, air bubbles
Spray bottle test	Mist a clean, dry section	Beads up: low. Soaks in after a moment: medium. Vanishes: high	Leftover product
Slip ‘n’ slide test	Run two fingers up one strand, tip to root	Smooth: low. Slightly textured: medium. Rough: high	Conditioner residue

Shed hairs beat a snipped tip for the float test. You can spot one by the tiny white bulb at the root, as the hair shedding vs breakage guide shows. Water moves fast. Hair with normal porosity takes up about 75% of the water it can hold within four minutes, per the NYSCC review.

How Accurate Is the Float Test?

The float test is the best-known hair porosity test, and the easiest one to get wrong. Hair is heavy enough to sink on its own. Surface tension holds it up, like a needle resting on water. Chemist Dr. Michelle Wong of Lab Muffin Beauty Science puts it bluntly: “These tests actually check for damage to the surface of hair.”

Your wash day says more than any glass of water. Salons have no better tool. How to choose a hair colorist covers asking for a strand test first.

Hair Porosity Test FAQs

Low porosity hair draws the most questions after a hair porosity test, mostly about moisture and buildup.

What are the signs of low porosity hair?

Water beads on it in the shower, and it takes ages to get fully wet. Drying takes ages too. Products sit on top and leave it coated or limp. Color often takes longer. Senior stylist Nicole Henry of Warren Tricomi told Forbes this hair “usually takes more time to soak.”

Is low porosity hair dry or oily?

Both, often on the same day. The lengths feel dry because water struggles to get in. Scalp oil and product sit on the surface instead, and roots can look greasy by day two. That oil comes from your scalp, though. Porosity doesn’t cause it.

How do you hydrate low porosity hair?

Warmth and water first, product second. Heat opens the cuticle, per the NYSCC review. So deep conditioning under a warm towel or steamer works. Leave-ins go on while hair is still damp. A few drops of a light oil, argan or jojoba, go on last.

What should you not put on low porosity hair?

Heavy butters and lots of protein are the usual troublemakers. Both tend to sit on the strand and build up. Henry suggests “minimal added proteins in the shampoo and conditioner” for this hair. Fine strands feel the weight first. Not sure yours is fine hair? Check before buying anything rich.

Should you shower every day if you have low porosity hair?

Daily showers are fine. Shampoo is the part that depends on your scalp. The American Academy of Dermatology says straight hair with an oily scalp may need it every day, while curly or textured hair needs it at least every two to three weeks. The best natural shampoo list has gentle picks.

Is frizzy hair high or low porosity?

Usually high. Not always. Humid air sneaks in under a raised cuticle, and not evenly. The hair swells and frizzes. Low porosity hair can still frizz from towel rubbing or from brushing curls once they’re dry. So frizz is a hint. It won’t settle the question alone.

Is it better to have high or low porosity hair?

Neither wins. Low porosity hair holds moisture well once it’s in, but it’s slow to take anything. High porosity hair takes color and conditioner fast, then loses both. Medium is easiest. Some salon guides call it the most common, though no large study has counted. High porosity hair has its own guide.

Can you change your hair porosity?

Your hair porosity test result can change. Bleach and relaxers push it higher. So do years of hot tools, and sun damaged hair shows the same wear. Long hair often ends up with mixed porosity, higher at the ends than the roots. New growth comes in at your natural porosity. Fillers like hair botox coat the strand, then wash out.