Protein vs Moisture: Reading What Colour-Treated Hair Needs.

Most heads that come in for a treatment have already self-diagnosed. The bottle in the bathroom said keratin. Or argan. Or rice water. We do not start there. We start with a wet strand, pulled gently between thumb and forefinger, and what we feel in those few seconds tells us what the colour-treated head actually needs.

The cortex is where the work lives.

Colour-treated hair is opened hair. The cuticle, the overlapping shingles along the outside of the shaft, has been lifted by an alkaline product so pigment can pass through. The pigment then settles in the cortex, the inner core that holds most of the strand's strength and most of its water. Everything we do afterwards, at home or at the bowl, is a conversation with a strand that has been opened on purpose. The science is older than the trends; the diagnosis is not.

We read the strand before we recommend a thing.

The reading is physical. We take a section near the parting, soak it through with warm water, and isolate a single strand between thumb and forefinger. We stretch it gently along its length, then let it go and feel what comes back. How far it travels before it resists. Whether it recovers to where it started, overshoots, or falls slack. How the surface feels under the pads of the fingers. That, more than any bottle label and certainly more than any quiz online, is what tells us where the strand sits between protein and moisture today.

It is the same reading we describe in our note on the first hour of a colour consultation in Glasgow, applied here to the question of what to put back into the strand and when.

A hair that snaps short is asking for protein.

When the wet strand barely stretches before it breaks, the cortex has lost its scaffolding. Human hair is roughly fourteen per cent cysteine, the sulphur-bearing amino acid that forms the disulfide bridges between keratin chains. Those bridges are the lattice that lets the strand bend and return. Repeated lift, repeated colour, repeated brushing of damp hair, all of it can break those bonds faster than the cortex can rebuild them. The signs at the chair are quick to find. The ends look limp without being heavy. The texture along the length feels rough, almost mineral. The strand snaps before it has any real travel in it. That is a protein reading, not a moisture one.

A hair that stretches and never recovers is asking for moisture.

The opposite reading is just as common. The wet strand pulls long, keeps going, and never returns to where it started. That is moisture loss. The cuticle, the gate the colourist opened to let pigment in, has not closed down properly afterwards. The cortex underneath cannot hold the water it needs, and the strand becomes elastic in the way an overcooked piece of pasta is elastic, not in the way good hair is. The signals on the dressing-room mirror are surface signals. Static when the brush comes through. A flatness in the tone that was there ten minutes earlier. Ends that drink in serum and feel dry again an hour later.

A home mask reaches the cuticle. The bowl treatment reaches further.

A supermarket mask, used patiently, does a useful job on the outside of the strand. It coats the cuticle, smooths the shingles, calms static for the next two or three washes. That is real value. What it cannot do, however well it is formulated, is rebuild what is missing inside the cortex. The molecules in a rinse-out mask are too large to travel past an undamaged cuticle, and where the cuticle is open enough to admit them, the cortex has usually lost more than the mask alone can give back.

It is the same boundary we draw when we explain what a keratin blowdry does to the hair shaft. A treatment that sits at the surface is a different piece of work to one that lands in the cortex.

What we mix at the bowl.

The deep conditioning treatment at Endz is not a single product. It is a base we adjust to what the elasticity test gave us that morning. A protein-led blend when the strand went short. A moisture-led blend when it went long. A balance of both, more often than people expect, because hair that has lived through two or three colour cycles is rarely starved in only one direction. The scalp is warmed first under our hands, which brings blood to the follicles and opens the cuticle the small amount we need. The treatment is left to penetrate, not to sit. The rinse is cool, to close the cuticle back down before the strand is towelled off.

The wider menu of what we do at the bowl, alongside the cuts and colours that bring people through the door, is set out on our services page.

The chair you only leave when the work is right.

A rhythm we suggest between visits.

For colour-treated hair, we generally suggest one structured mask at home each fortnight, alongside a bowl treatment on visit days. The first weeks after a balayage or a full-head colour, the strand wants moisture more than it wants protein. The cuticle is still settling, the cortex is still recalibrating, and the kindest thing to do is rinse in cooler water and use a hydrating mask. Closer to week eight, the rhythm changes. The cortex has had time to seal; that is the moment for a protein-leaning mask once a fortnight, ahead of the next visit.

The mistake worth naming.

The most common reason a colour-treated head stops looking like itself between visits is not the absence of care. It is the wrong correction. A protein mask on hair that is moisture-starved makes the strand harder, drier, more brittle within a single wash. A moisture mask on hair that needs protein gives a soft evening and a limp week. We test for what is missing before we recommend what to put back. That is what the consultation hour is for, and what twenty-eight years on the chair has taught us to read in the first wet stretch of a strand.

If you would like us to read your own hair before you spend another week on the wrong mask, the diary is open by appointment.