ROJI — The scent comes from the tea, not from fragrance

Camellia sinensis branch, botanical illustration

The reason this exists

Why most nice-smelling skincare is a problem

Scent in skincare almost always comes from essential oils. Essential oils contain monoterpenes — most commonly limonene and linalool.

On contact with air, light and heat, those molecules oxidise into hydroperoxides. Hydroperoxides bind to proteins in your skin, and your immune system starts treating them as something to fight. That is the mechanism behind a large share of allergic contact dermatitis from cosmetics.

6.9% and 5.2% In 2,900 dermatitis patients patch-tested across six countries, 6.9% reacted to oxidised linalool and 5.2% to oxidised limonene — two of the most common scent molecules in skincare.

Bråred Christensson J, Karlberg AT, Andersen KE, et al. Contact Dermatitis 2016;74(5):273–80. doi:10.1111/cod.12545

Roasting tea leaves at 160–180 °C produces alkylpyrazines instead — the same class of molecule that gives bread crust and coffee their smell. They don't carry the chemistry that turns into sensitising hydroperoxides.

So we built the entire water phase out of them. That is the whole product.

The two molecules

What changes, and why it matters

In most scented skincare

Limonene · C₁₀H₁₆ → limonene hydroperoxide

Monoterpene

The double bonds are what make it smell — and what let oxygen attack it. The oxidised form is the sensitiser, not the fresh oil.

In ROJI

2-ethyl-3,5-dimethylpyrazine · C₈H₁₂N₂

Alkylpyrazine

An aromatic ring with two nitrogens, made by the Maillard reaction when tea is roasted. No hydroperoxide-forming chemistry. It is what roasted tea smells like.

Where this sits

You've had two options. Neither works.

Clinical brands are safe and joyless. Luxury brands are pleasant and full of the compounds that cause the reaction. Most people with reactive skin end up buying the boring one and quietly resenting it.

	Clinical drugstore	Scented luxury	ROJI
Scent source	None, or masking fragrance	Essential oils	Roasted-tea pyrazines
Water phase	Water	Water + fragrance	100% hojicha hydrosol
Surfactant	Conventional synthetic	Varies, often blended	Single amino-acid system
Target pH	Varies	Often alkaline	5.0–5.5
Acids / retinoids	Sometimes	Often	None
Safety panel	Standard, healthy skin	Standard, healthy skin	Reactive-skin panel
Experience	Functional	Pleasant, risky	Pleasant, by design

Columns describe category conventions, not any specific brand. Formulations vary widely within each.

The formulation

No acids. No retinoids.
Nothing that stings.

We're not going to tell you this brightens, resurfaces, or does anything about fine lines. That's deliberate, and it's the point.

AHAs and BHAs flare reactive skin. L-ascorbic acid stings on a compromised barrier. And a retinoid in something you rinse off after sixty seconds is just an expensive ingredient going down the drain.

Uji hojicha hydrosol — the entire water phase

Sodium cocoyl alaninate — amino-acid surfactant

Barrier complex — ceramide NP, panthenol, allantoin, Cica, Tremella

Humectants — glycerin, multi-weight hyaluronic acid

Preservation & pH

Proportions are indicative of the formulation approach, not a final manufacturing specification. No bench sample has been produced yet.

Acid mantle

Bar soap ~9–10 ROJI 5.0–5.5

pH 357911

Healthy skin sits slightly acidic. Alkaline cleansers push it out of range, and on a compromised barrier it takes longer to come back. ROJI is formulated to land inside the skin's own range rather than above it.

Technical diagram of the 150ml ROJI foamer bottle

Drawing, not a photograph — the pilot bottle has not been produced yet.

Water phase	100% steam-distilled Uji hojicha hydrosol. No added water.
Surfactant	Sodium cocoyl alaninate — an amino-acid system, not a sulfate one
Target pH	5.0–5.5, the skin's own range
Barrier support	Ceramide NP, panthenol, allantoin, multi-weight hyaluronic acid, Tremella, Cica
Format	150ml micro-foam through a double-mesh mechanical pump
Use	Daily, in the shower. 60–120 seconds, then rinse.
Bottle life	About 2.5 months at two pumps a day

Provisional ingredient list

Aqua (Uji Hojicha Steam Distillate), Glycerin, Sodium Cocoyl Alaninate, Coco-Glucoside, Panthenol, Allantoin, Ceramide NP, Sodium Hyaluronate, Hydrolyzed Hyaluronic Acid, Tremella Fuciformis Sporocarp Extract, Centella Asiatica Extract, Avena Sativa (Colloidal Oat) Kernel Flour, Butylene Glycol, Citric Acid, Sodium Citrate, Sodium Phytate, Sodium Benzoate, Potassium Sorbate.

This list is provisional and will change. No manufacturer has produced a bench sample yet. The finished, audited INCI goes to everyone on this list before anyone is asked to pay a full price. If a supplier can't hit a line on this spec, we'll tell you which one and why.

Daily use

Sixty seconds, in the shower you were taking anyway

Two pumps

The double-mesh pump makes a dense micro-foam, so it spreads without the friction a cream or gel needs. You're not dragging anything across your face.

Leave it 60–120 seconds

Shower steam carries the roasted-tea aroma while the foam sits. Warm water, around 37–38 °C — not hot. Hot water dilates facial vessels, which is the last thing this skin needs.

Rinse

The amino-acid system rinses clean without stripping. Skin is left soft rather than tight, which is what the barrier ingredients are there to support.

Where we actually are

ROJI isn't made yet. There's no inventory in a warehouse and no bottle we can send you today.

We're taking $5 refundable reservations so we know how much to make, and so we're not guessing at a number and then eating it.

Before anything ships, it gets safety-tested on a panel of people with reactive skin — not the standard panel on healthy skin that most brands run. That test costs several thousand dollars and it's the line in our budget we're least willing to cut, because a standard panel doesn't tell you much about the people this is for.

If we don't ship, you get your $5 back. If we do, it comes off the price.

Why we're building this

Peace comes first

Milan Au, co-founder of ROJI — Milan Au · Arashiyama, Kyoto

My cousin struggled back in his elementary years as his sensitive skin caused asthma attacks, and it hurts knowing that his family saw him suffer.

The thing that always gets me is that after living through tough times, he was no longer asking for much. He has been content with joyless products, but understands that we all deserve to enjoy tranquil peace. Every product that was safe was boring, and every product that was pleasant had irritating fragrance in it.

So we started learning more about the chemistry that goes behind the ingredients in our skincare products. The problem was that essential oils oxidize, while aroma molecules do not. We found that roasted tea has its own aroma molecule to focus our idea on.

We're working with a small-lot cosmetics manufacturer in Japan to make it a reality. It's slow, but the care for quality is what makes safety something we can be proud of.

Milan Au Co-founder, ROJI

Questions

The ones worth answering

If it smells of tea, isn't that a fragrance?

Fair question, and the honest answer is that ROJI is not a fragrance-free product. It smells of roasted tea on purpose. The difference is where the smell comes from: pyrazines from roasting, rather than monoterpenes from essential oils. If you need a product with no scent at all, this isn't it — and we'd rather say so than sell you the wrong thing.

Is it a daily wash or a mask?

Daily. It's designed as your everyday face wash, used with a 60–120 second dwell in the shower rather than a ten-second lather. At two pumps a day, a 150ml bottle runs about two and a half months.

Will the hojicha stain anything?

No. Steam distillation carries the aroma compounds over and leaves the colour behind — the hydrosol comes off clear, not brown.

My skin reacts to almost everything. Will this be fine?

We can't promise that, and we won't. No cosmetic can be guaranteed non-reactive for everyone, and standard safety panels don't capture the most reactive skin — which is exactly why we're paying for a reactive-skin panel instead. What we can tell you is what's in it and what isn't, and we'll send the finished ingredient list before you're asked to pay a full price. Patch test on a small area first, as with anything new.

Why Japan?

Two reasons. Japanese formulators have worked with amino-acid surfactants since the chemistry was commercialised there, so stabilising an amino-acid micro-foam isn't a research project for them. And custom steam-distilled tea hydrosol is a domestic ingredient in Japan rather than an import, which makes every bench trial cheaper.

What does it cost, and when?

The pilot batch is priced at $50 for 150ml. We're finalising a 500-unit run with a manufacturer in Japan. We'll email you the audited ingredient list and real dates before anyone is charged the balance.

Why should I give you $5 for something that doesn't exist?

Because it tells us something an email address doesn't. A list of emails doesn't tell us whether anyone actually wants this at $50 — and we'd rather find that out now than after committing to a production run. It's refundable, in full, for any reason.