Open a drawer in any salon that has been working since the seventies and the layers read like sediment. Plastic caps at the back, stiffened with use. Aluminium foils stacked in their folded squares, kept because someone still asks for them. And on top, the brushes: the soft-bristle balayage flat, the tint brush, the rat-tail comb worn smooth at the handle. The history of hair highlighting techniques, sitting in one drawer.
That is roughly the span the work has crossed. From the cap and its hook, through the foil, into the freehand sweep, and on into the era of bonded chemistry and tonal glazing. We have worked through three of those four eras on the chair, and we keep examples of the first one in a small wooden box, the way some hairdressers keep their first apprenticeship scissors. The tools do not get thrown out. They become the history of the trade.
What follows is a long piece, written from the bowl. Read it the way you would read a small museum wall text in a hair salon, with the kettle on.
The first cap, and what it could and couldn't do
The highlighting cap arrived in the early twentieth century and was refined into the form most British salons would recognise during the 1960s. A perforated plastic cap was pulled tight over the head, and a small metal hook was used to draw fine strands of hair up through the holes. Bleach was painted on the lifted strands. The unlifted hair stayed under the cap, untouched, kept dry by the plastic seal. According to industry histories of the trade, this was the first method that produced consistent, repeatable highlights at any scale.
What the cap could do was straightforward. It separated cleanly. It kept the bleach off the scalp. It produced a head of fine, evenly spaced lighter strands without the colourist having to map every section by hand. For a generation of women coming out of the rigid sets and rinses of the fifties, that was a real change. The cap was the technology that made highlighting an everyday salon service rather than a Hollywood one.
What it could not do was follow the head. The hair came up through the holes in the order the holes had been moulded into the plastic. You could not put a highlight where you wanted it. You could only put one where the cap allowed. Placement was the cap's, not the colourist's. The result, looked at honestly, was uniform. A kind of speckled brightness across the whole canopy, the same density at the parting as at the nape. Most of our older clients will remember the look from the late seventies. It was an excellent first answer to a real problem. It was not the last answer.
The foil arrives, and the head opens up
The aluminium foil reached salon use through the 1980s, and the placement question was finally answered. A slice of hair was laid on a square of foil, bleach was painted on it, and the foil was folded into a small parcel. The parcel held the lifting product, kept it warm, and isolated the slice from everything next to it. Histories of the trade generally credit the eighties as the moment foils replaced caps as the dominant highlighting method in professional salons.
Foil did three things the cap could not. It put placement back in the colourist's hand. A foil could sit at the front of the canopy, around the face, or only in the under-layer. It opened up the strength of the lift, because the parcel held heat and the bleach was free to do more work in a smaller window. And it made the slice itself a designable thing: thick or thin, dense or sparse, regular or staggered. The same product, used in two pairs of hands, started to produce two very different heads.
Foil also brought the look that anyone of a certain age will remember: sharp face-frames, hard contrast at the parting, stripes that read in photographs from across a room. Most of that was placement, not chemistry. Once colourists learned to step the foils away from the parting, to vary the slice density across the section, and to leave a soft root, the foil became the workhorse tool it still is. It remains, in much of the trade, the answer to anything that needs precision. A sharp face-frame. A corrective lift on a stubborn ribbon of regrowth. A money-piece sitting only at the front of the canopy.
Paris, 1974, and a sweep of cotton wool
While the rest of the trade was being remade by the foil, a different question was being asked in Paris. In 1974, at the Carita salon on the Rue du Faubourg-Saint-Honoré, a colourist called Yvan started painting bleach freehand into the canopy and lifting the strands away from the rest of the head not with foil but with strips of cotton wool. The first client he worked on this way, recorded in trade histories as a Miss Weston, is reported to have needed roughly 1,300 feet of cotton wool to complete the head. The technique was called balayage au coton, from the French balayer, meaning to sweep.
The journalist Angela Taylor wrote the new approach up in the New York Times on the first of April 1974, in a piece on how Paris salons were changing the colour offer. That article is the first English-language record we have found of the technique reaching a wider audience. It would take until the late nineties and the early 2000s for balayage to become widely available outside Paris, and another decade after that for it to land as the dominant freehand method in British salons. Our part of Glasgow saw it later still.
What balayage answered was a question the foil had not asked. The foil cared about precision. The balayage cared about where the light would fall. Yvan's idea, in its plainest form, was to paint the lift the way an art teacher would paint highlights on a portrait: where the sun would hit if the head were turned to the window. The result is softer at the root, brighter at the ends, and entirely follows the cut. It is a technique that asks the colourist to look at the head as a whole shape rather than as a grid of sections.
We have written elsewhere about what hand-painted balayage actually requires of a colourist on the chair, and a separate piece on how the same technique sits on a darker base.
If your hair is closer to a true brunette, the technique changes again, and the way balayage reads on dark hair is worth its own conversation. The short version is that freehand is harder to teach than foil, because the answer is in the eye, not in the section.
What the eighties and nineties consolidated
For about twenty years, foil and balayage ran in parallel. In most British salons, the foil did the work. Balayage was the Parisian option that travelled to London by the late nineties and into the rest of the country in the 2000s. Both techniques were refined while they ran. Foils got thinner and more precise. The lighteners themselves moved through several generations, getting kinder to the hair shaft and more consistent in their lift levels.
Two consolidations matter for the way we work now. The first is that the trade learned, mostly the hard way, the difference between a great foil head and a great balayage head. They are not the same brief, and they are not the same client. A foil head wants definition and contrast. A balayage head wants depth and shadow. Used in the wrong place, both techniques disappoint. We see this most often when a client comes in for a correction, and the original brief had asked the colourist for one thing while the technique selected was set up to do the other.
We have written separately about the three mistakes that most often need fixing on a colour correction, and the foil-versus-balayage mismatch is the most common of them.
The second consolidation is the toner. Once foils and balayage produced lighter ribbons in volume, the lighter ribbons themselves needed to be glazed back to the right tone. The eighties left a generation of women with brassy highlights because the toning step was either skipped or under-developed. By the mid-nineties, the toner had become a proper second stage in the appointment, not an afterthought.
Gloss, toner, the second half of the work
In the late eighties, Redken launched Shades EQ, a low-volume oxidative gloss without ammonia, designed to sit on top of a lift and deposit tone without lifting further. Trade histories generally credit Shades EQ as the first widely adopted demi-permanent gloss in the professional category, and most working colourists since have used either Shades EQ or a near-cousin built on the same principle.
The arrival of the gloss changed how the appointment was structured. A lift, on its own, leaves the hair somewhere on a yellow-orange spectrum, depending on the base. The toner pulls that yellow-orange into the colour the client actually came in for: a cool beige, a soft champagne, a warm honey, an ash that does not turn green over time. The gloss is the second half of the work. It is also the half most easily skipped at home, which is why salon colour holds its tone for longer than a kit from the chemist.
For us, the gloss is the moment the appointment becomes considered. The lift is structural. The gloss is editorial. It is where the colourist makes the final call about how warm, how cool, how shiny, how matte. On the chair, this is the moment we will hold a small piece of hair to the light by the front window and judge it against the rest of the head. What we are looking for is whether the tone agrees with the skin under the salon lights, and whether it will still agree under daylight on Paisley Road West when the client steps out.
Bond technology and the patience of the grow-out
In 2014, Olaplex launched and changed the conversation again. The bond-protecting category, built on patents originally filed by the chemists Eric Pressly and Craig Hawker, allowed bleach to be pushed harder without the cortex disintegrating. The full mechanism is more complex than we are going to set out here, but the everyday effect is that a head can take a brighter lift, more often, and the hair will hold together for longer. Other bond systems have followed; the category is now a standard part of any colour offering.
Bond technology is a genuine advance. It is also frequently oversold. What it does not do is replace a careful colourist. The most common mistake we see at the chair is a head that has been bonded, then over-lifted because the bond was believed to be insurance. The hair survives, in the technical sense. The condition slides. Bond protection raises the ceiling on what is possible. It does not raise the floor on what is wise.
The other shift, less talked about, is the way modern balayage has been designed for a long grow-out. A well-painted head will look its honest best at weeks eight to twelve, not on the day it leaves the salon, which is why how a colour grows out is now part of the brief from the first consultation. The new colourist's job is not just to leave the client looking right today. It is to leave them looking right for the next twelve weeks.
The chair you only leave when the work is right.
What the chair has kept, and what it has let go
Twenty-eight years on the chair, since 1997, gives a person enough timeline to know which tools deserve a place in the drawer and which ones are noisier than they are useful. We have kept the cap, but we have not used one in earnest for at least a decade. We use foil for face-frames, money-pieces, root retouches on a strong contrast, and any correction work where the question is precision. We use balayage, hand-painted, for the everyday colour brief: a soft canopy, a brighter face-frame, the kind of head that grows out into shadow rather than into a line.
The toner is now the close of every colour appointment, not an option. The bond protectant sits in every formula. The cotton-wool sweep that Yvan worked at the Carita salon in 1974 has, in a quiet way, become the default of professional colour fifty years later. The trade had to widen out, fail at a few extremes, and come back to the idea that the colourist's hand, working freehand, is still the answer to most of the head.
Endz Hair Boutique sits on Paisley Road West, in the south side of Glasgow, in a single-chair, single-guest room. The salon has been at this address since 2020. The colour work today is hand-painted, finished with a tonal gloss at the bowl, with a bond protectant in the formula. Most of what arrives in the chair has come from somewhere else: a foil head that needs softening, a balayage that lost its tone, a root retouch that needs to stop ageing the rest of the canopy. The consultation is where the work begins.
If you would like to see how the timeline reads on your particular head, the route in is to book an appointment for a consultation, and we will tell you honestly what the chair is looking at.