'Tone-Up' Isn't One of Korea's Functional Cosmetic Categories. In Our Sun Cushion It's Three Iron Oxides.
Our sun cushion has twenty-nine ingredients in it. Three of them are doing things that Korean law takes seriously enough to review before the product can be sold. None of those three appear in the product's name.
The word that does appear, in the largest type on the front, is "tone-up". It is the only claim on the package that nobody had to submit anything for.
This is not a scandal. It is a fairly ordinary consequence of how the category system works, and once you see it you will see it on every shelf.
Korea licenses functional cosmetics by category, and the statute lists five heads: whitening, wrinkle improvement, tanning and UV protection, changing or removing hair colour or nourishing hair, and preventing or improving dryness, cracking, hair fall and keratinisation. Tone-up is not on that list at any level. In our MARSHIQUE cushion the regulated claims are the UV filters, niacinamide and adenosine, and none of them are in the product's name. The tone-up itself comes from yellow, red and black iron oxide with an aluminium hydroxide coating. That is makeup, sitting in a sunscreen, described by the one word that never had to be proven.
Everything regulated on this label is invisible
Read the ingredient list of the MARSHIQUE Serum Glow Tone-up Sun Cushion and three lines are doing regulated work.
Zinc oxide and titanium dioxide are UV filters, which is a functional category. Niacinamide is a listed whitening active. Adenosine is the wrinkle-improvement active, and the notified use level for it in Korea is 0.04% — a number that does not appear anywhere on the package, because it does not have to.
So this is a product carrying three separate functional claims through a review process, and the front of it says "serum glow tone-up". The regulator looked at the sunscreen, the whitening and the wrinkles. It had no reason to look at the glow.
Where the tone-up actually comes from
Our data files three ingredients in this product under Tone-up Pigment: yellow iron oxide, red iron oxide and black iron oxide. There is also aluminium hydroxide, filed as a pigment coating, which is the standard surface treatment on titanium dioxide pigment.
Iron oxides in those three shades are how every foundation on earth gets its colour. Mixed in the right ratio they make beige; skewed one way they make pink. Put a small amount of that mixture over titanium dioxide's white scatter and you get a face that reads brighter and slightly warmer in a mirror.
It is cosmetics in the oldest sense of the word. Pigment sitting on top of skin, changing the light that comes back off it.
Which is worth knowing for a practical reason rather than a moral one: it washes off, it transfers onto collars, it can go grey under a flash, and it does not accumulate into a result over six weeks. A whitening active behaves completely differently from a pigment, and this product contains one of each.
What "functional" means here, and what it does not cover
Korea's Cosmetics Act sets up a middle tier between ordinary cosmetics and drugs. The statute defines it in five heads: products that help whiten skin; products that help improve wrinkles; products that help tan skin attractively or protect it from ultraviolet; products that help change or remove hair colour, or nourish hair; and products that help prevent or improve dryness, cracking, hair fall and keratinisation caused by weakened skin or hair function.
The enforcement rule expands that fifth head into the named categories most people recognise — hair-loss relief, acne-prone skin, dryness in atopic skin, stretch marks. A product claiming any of it files for review before it goes on sale.
Tone-up is not there. Neither is glow, radiance, dewiness or any of the other words that sell most of this category. We checked both levels, the statute and the rule, and the word does not appear in either.
The consequence is easy to state and slightly uncomfortable. The claims that had to be proven are the ones written in small type in the ingredient panel. The claim that carries the purchase is the one that never had to be anything at all.
Whitening is the head that trips English-speaking readers up. In Korean regulation it covers preventing and improving pigmentation — melanin production, spots, unevenness — rather than making skin paler as a general goal. Niacinamide qualifies on that basis. A pigment that makes you look lighter in a mirror does not, which is the whole distinction this article turns on.
The white cast is the product working
There is a habit online of treating white cast as a defect. In a tone-up product it is the feature, and complaining about it is like complaining that a concealer covers things.
Titanium dioxide scatters visible light as well as ultraviolet. That scattering is why mineral sunscreens look pale on skin, and it is also why they work. A tone-up formula takes that pale scatter and warms it with iron oxide so it lands closer to skin instead of sitting on top of it as chalk.
What deserves the complaint is not the cast. It is that nothing on the package tells you a pigment is involved, so nobody knows to expect a shade that either matches them or does not.
Foundation gets sold in twenty shades. This gets sold in one, described as a glow.
What our screening found
We scored this 9.5 and every one of its twenty-nine rows came back low, which is a genuinely clean sheet. We should have caught something else, though. Our own function column invented the string Tone-up Pigment for the three iron oxides, which means we imported the brand's marketing word into our database and then used it as if it were a technical classification. Iron oxides are colourants. Filing them under a term with no legal meaning, in the one field that is supposed to say what an ingredient objectively does, is us doing a smaller version of exactly what this article is about. We are re-filing them as colourants.
MARSHIQUE Serum Glow Tone-up Sun Cushion SPF50+/PA++++ 12g
Mineral filters, niacinamide and adenosine, plus three iron oxides that supply the tone-up. Sold in one shade, so treat it as a tinted product rather than a clear one and check it against your own skin in daylight.
The practical takeaway
Treat any word on a Korean cosmetic as belonging to one of two piles. Whitening, wrinkle improvement and UV protection went through a review and mean something specific. Tone-up, glow, radiance, brightening-as-a-feeling and dewy went through nothing, and are describing an effect in a mirror.
Both piles can be worth paying for. A pigment that makes you look better today is a real product doing a real job. You should just know you are buying makeup, and buy it the way you buy makeup — by checking the shade.
If you want to find the regulated part of a package, look for the active list rather than the name. Korean products print their functional actives, and the interesting ones are almost never on the front.
We have written before about which label claims carry weight and which do not, and about why Korean sunscreens feel different from American ones. If you are working out how much of any of this survives a real day outdoors, reapplication is the piece that matters most. Our scoring method sits on the awards page.
- 「화장품법」 제2조제2호 — the five statutory heads of 기능성화장품. Verified against 법제처 「찾기쉬운 생활법령정보」, 화장품 > 기능성화장품의 심사 등.
- 「화장품법 시행규칙」 제2조 (기능성화장품의 범위) — the enforcement rule expanding the fifth head into named categories.
- 「화장품법」 제4조 (기능성화장품의 심사 등).
- 「기능성화장품 심사에 관한 규정」 — adenosine as a notified wrinkle-improvement active at 0.04%.
- 「화장품 광고 자문 기준 및 해설서」, 대한화장품협회, 2023.
- Regulation (EC) No 1223/2009, Annex IV — iron oxides as listed cosmetic colourants (CI 77491, 77492, 77499).
- DHALIORA screening data: 56 products, 1,920 ingredient rows, full recount 2026-09-06. MARSHIQUE cushion, 29 rows, no flags.
