Chinese and Southeast Asian perms

数码烫, and the family it belongs to

The digital perm did not stay Japanese for long. Across mainland China, Taiwan, Hong Kong, Vietnam, Thailand, Malaysia, Singapore, Indonesia and the Philippines it became the ordinary way of waving dark, dense, straight hair, and it picked up a different vocabulary and a different commercial logic on the way.

In mainland China the service is 数码烫 (shu ma tang), literally digital perm. It sits inside a family called 热烫 (re tang), hot perm, alongside the older and dearer 陶瓷烫 (tao ci tang), ceramic perm, and opposite 冷烫 (leng tang), the cold wave. 热塑烫 (re su tang), heat-set perm, names the hotter end of the family.

Note what is not happening in that list. Hot and cold are not ranked as new and old, or better and worse. They are two instruments.

Taiwan writes digital as 數位, so the literal calque 數位燙 (shu wei tang) exists and is used — but Taiwanese menus more often say 溫塑燙 (wen su tang), warm-set perm, with 熱塑燙 reserved for a hotter tier above it. Hong Kong uses 電髮 (din faat), electric hair, as the general Cantonese word for a perm, with the digital service written 數碼曲髮, digital curl-hair, beside 陶瓷曲髮, ceramic curl-hair. I have no sourced romanisation for those two phrases and have not invented one.

Three real divergences from the Japanese practice

ONE

Split by cost, not prestige

Here the digital perm is the affordable everyday machine and the ceramic perm the expensive one. Chinese trade writing describes ceramic units running into five figures in yuan, with rods costing hundreds each, which is why the lighter digital rig became the default. In Japan the digital perm is the premium service. In China it is the sensible one.

TWO

The wind stops short of the root

Chinese technical and consumer writing states plainly that a hot perm cannot curl at the root, and treats that as a property to work with rather than a fault to apologise for. On heavy, dense hair, keeping the root flat is precisely what stops the head looking enormous.

THREE

The menu leads with the look

A regional price list is organised by named style, with technique appearing only as a line explaining why one costs more than another. The client books a shape; the stylist chooses the chemistry. That is a healthier arrangement than it sounds, and closer to how I work than a menu of lotion names would be.

The second of those produces a habit I think the West should steal.

Cold wave at the root, hot perm through the lengths: two tools on one head, chosen for what each is actually good at.

Fine or sparse hair that wants fullness goes to the cold wave, which winds right down to the scalp and lifts. Heavy, dense hair goes to the digital perm through the mid-lengths and ends. That is a genuine divergence from the Japanese framing, in which the digital perm answers almost every long-hair brief, and it is a better answer for fine hair than the Western default of treating the hot perm as an upgrade on the cold one. If root lift is the whole of what you want, the service is root volume, and it is a cold wave.

The wool curl, and the vocabulary around it

The dominant mass-market shape of recent years is 羊毛卷 (yang mao juan), literally sheep’s-wool curl, rendered on Hong Kong, Taiwanese and Malaysian salon sites as the wool curl or wool perm. It is a small, dense, spiral curl carried from high on the head down to the ends, and it is chosen for volume rather than glamour. Chinese trade writing treats 绵羊卷 (mian yang juan) and 法式卷 (fa shi juan), the French curl, as the same family at slightly different diameters, and says so bluntly, which is more honesty than most Western trend vocabulary manages.

Around it sits a fast-moving list a regional stylist is expected to keep up with:

Name	Romanised	The shape
水波纹	shui bo wen	Water ripple — even, continuous S-waves
云朵烫	yun duo tang	Cloud perm — soft light arcs with flicked ends
气垫烫	qi dian tang	Air-cushion perm — root lift with a light curl at the ends
蛋卷烫	dan juan tang	Egg-roll perm — a much larger, neater wave, done hot rather than cold

These are live bookable requests, not magazine language, and Chinese-speaking clients in London ask for them by name. If a stylist does not recognise the word, the useful follow-up is not a translation but a photograph and a rod diameter — every one of these is a decision about diameter and wind pattern before it is anything else. See rod size versus shape.

Men’s work, which is largely not a machine service

锡纸烫 (xi zhi tang), the tin-foil perm, really does use foil. Cream reducer is applied, thumbnail-width sections are twisted and wrapped in foil, heated for about a quarter of an hour, then set. 烟花烫 (yan hua tang), the firework perm, is a finer and more vertical version of the same idea. The look is nicknamed 渣男烫 (zha nan tang), the cad’s perm, which tells you everything about how it is worn. It needs only a few centimetres of length, which is why it took hold on short men’s hair where nothing else would.

The menu word changes at every border

Vietnam: uốn nhiệt hot perm · uốn setting the commonest menu word of all, an English borrowing · uốn lạnh cold wave · uốn mái a fringe perm
Thailand: ดัดดิจิตอล digital perm, built on ดัดผม, to perm the hair · ดัดเย็น cold wave
Indonesia: keriting digital digital curl, from keriting, curly. Consumer press there calls it a Korean import rather than a Japanese one
Malaysia and Singapore: digital perm · Korean perm · C-curl · S-curl menus are largely English; Chinese-language salons use 数码烫
Philippines: digiperm almost universally contracted on price lists. The Filipino word for curly is kulot

Vietnamese is the entry worth pausing on, because uốn setting is what the board actually says in most of the country. A client who books a setting perm in Hanoi and one who books a setting perm in Seoul are using the same borrowed English word for the same heated-rod service, arriving from two different directions. I keep the Vietnamese tone marks here, as this library does everywhere: they are not decoration, they are the spelling.

One deliberate exclusion. Thai and Indonesian menus also carry straightening services, and those are a different category of chemistry altogether. They are not on this page and they are not perms in the sense this library uses the word.

Why there is no number on this page

This is the question I am asked most often about regional hot perms, usually in the form: my salon at home ran the rods hotter than yours does, is that bad? And the honest answer starts by admitting that nobody can tell you what either salon was running.

The published ranges in mainland China, Taiwan, Japan and Korea are not the same ranges. Mainland technical writing for hairdressers, Taiwanese trade material for the warm-set tier, Korean salon practice and Japanese manufacturers’ own documentation give bands that overlap in places and diverge in others, and where they diverge they are not close. The setting depends on the country’s practice and on the hair type before it depends on anything else: coarse resistant hair and fine hair are not run at the same setting on the same machine. There is no industry standard behind any of them, and there is no body that could impose one, because the setting a rod is run at is also a function of the machine, the lotion designed for that machine, the condition of the hair and the point in the cycle — variables that no single figure can carry.

Trade sources disagree. That is exactly why no figure belongs on a page a client can read.

There is a practical reason on top of the honest one. A temperature published on a website is reproduced at home, with a curling iron, by somebody who has read the number and not the four variables around it. The number is the only part that travels, and it is the least useful part. So this library says the rods are warm rather than iron-hot, says that the setting depends on country, hair type, machine, lotion and cycle together, and stops there — on this page, on the digital hot perm, and on digital perm machines.

What actually matters is not the dial but whether it was matched to the hair in front of it, and regional technical writing is explicit about lowering the setting for compromised hair. That instinct is the competent part. The number is the part that does not travel.

You will notice something else about this page: it names no machine manufacturer at all. That is deliberate. Searches for regional digital perm machine makers return wholesale marketplace listings rather than verifiable companies, and this library does not print a brand it has not checked against the firm that makes it. The Japanese makers that can be checked are named on the Japanese perm houses. That is the whole of the verified list.

Two things to know before reading a regional price list

The prepaid card. Salons across mainland China run heavily on 办卡 — buying a stored-value membership up front at a discount in exchange for committing future spend. It is convenient, and it is also the source of most consumer complaint in the sector: cards sold at several thousand yuan, services quoted at one price and billed at several times more, and a steady stream of press coverage about it. A perm there is rarely priced as a one-off. It is priced as an entry point to a card. If you are comparing a price you paid abroad with a price you are quoted here, that is very often what the gap is.

The nickname. Chinese hairdressers are collectively and affectionately called Tony老师, Teacher Tony, a name the press traces to the Toni & Guy chain and to a Beijing studio trading in English as Tony Studio. It is worth knowing simply because a client may use it to me, and it is not an insult.

Why this page exists at all

Scale. This is where most of the world’s digital perms are actually performed. Any account of the hot perm written without reference to Chinese and Southeast Asian practice is describing a minority of the service and calling it the whole.

What travels, and what does not

If you had a hot perm in the region and you are now sitting in front of me, three things follow. The shape you were sold has a name and the name is useful — bring it, or bring the photograph. The hair has been heated as well as reduced, so its porosity is not what an unpermed head’s is, and any subsequent service is chosen for the hair as it is now rather than as it was. And the curl is dry-active: it will look loose and disappointing wet for as long as you own it, and that is not a fault.

The regional two-tool habit is worth importing. Cold wave for root volume on fine hair, hot perm for the lengths on dense hair, and the discipline of not treating one as an upgrade of the other. Booking-wise, that is cold waving and hot waving, and they are different services for different problems.

The line that does not move in any market

Usually no — and usually is doing real work in that sentence. Bleaching oxidises cystine into cysteic acid; a neutraliser needs two sulphur atoms to build a cross-link and cysteic acid supplies none, so most bleached or highlighted hair takes a curl that drops out within weeks while the hair pays for it. Adding a heated rod to that does not help it. That is the default and the default is no. Highlights count, foils count, and grown-out bleach still on the lengths counts, and no named look, no regional variant and no lower setting is what changes the answer. It is a judgement made on the hair in front of me — how much lightener, how long ago, how much has grown out, what condition the rest is in — and occasionally, in the right hands and at the right strength, it is possible. Assume no, and come and let me look rather than deciding from a page. See bleach damage.

Hydroxide-relaxed hair is never permed either, in either direction: perm versus relaxer sets out why the two chemistries cannot meet.

Questions

What does 数码烫 mean, and is it the same as a Japanese digital perm?

数码烫 (shu ma tang) is simply Chinese for digital perm, and the method is the same: chemical reduction, heated rods on a controlled unit, then an oxidising neutraliser. What differs is its place on the menu. In China it is the affordable everyday hot perm rather than the premium one, and the wind stays off the root on purpose.

Why do salons in the region still push the cold perm so hard?

Because it does something the hot perm cannot. Cold rods wind right down to the scalp, which makes the cold wave the better tool for root volume and for fine or sparse hair. Regional practice treats the two as different instruments rather than an old version and a new one, and that is the correct reading.

What is a wool curl?

羊毛卷 (yang mao juan), sheep’s-wool curl: a small, dense, spiral curl worn through the whole length, chosen for volume rather than glamour. Chinese sources treat 绵羊卷 and 法式卷, the French curl, as the same look at slightly different diameters. It is a rod diameter and a wind pattern, not a chemistry.

Is the tin-foil perm really done with tin foil?

Yes. 锡纸烫 (xi zhi tang) is a men’s service: cream reducer applied, small sections twisted, wrapped in foil, heated for roughly fifteen minutes, then set and washed out. It needs only a few centimetres of length, which is why it works on hair too short for any rod.

My home salon ran the rods hotter than you would. Should I be worried?

Neither of us can honestly say what either salon was running, which is the first thing to be clear about. The published ranges in mainland China, Taiwan, Japan and Korea are not the same ranges and the trade sources disagree, so no number quoted at you is authoritative — it turns on the country’s practice and on the hair type, and coarse resistant hair and fine hair are not run at the same setting. What I can read is the hair: its porosity, its elasticity, and how it behaves under tension now. That tells me what it can take next, which is the question you are actually asking.

I had a digital perm in Asia and it looks flat when I wash it. Has it dropped?

Almost certainly not. Every digital perm is curliest when dry — the shape is set thermally into the cortex and reappears as moisture leaves the fibre. Wet, it looks loose and nearly straight. Diffuse it, or twist sections round your fingers as you blow-dry, and the wave comes back. It is the commonest misunderstanding after the service anywhere in the world.