March 4, 2026 5 min read
Mineral sunscreen without the cast
Why zinc turns skin white, why three tints were the honest answer, and how to apply a mineral sunscreen so it does not pill.
By Tobias Renwick, Head of Formulation
We spent two years on a sunscreen. Not on the protection, which is the straightforward part, but on the two reasons people give for not wearing a mineral one: it leaves a white cast, and it rolls into little balls under makeup. A sunscreen nobody wears protects nobody, so those two problems were the brief.
Why mineral filters look white
Zinc oxide protects by sitting on the surface of the skin, covering both UVA and UVB. It is also a white pigment. Put enough of it in a formula to reach a high SPF and you have, in effect, put a thin layer of white on your face.
On fair skin that can pass for a slight brightening. On medium and deeper skin tones it reads as gray or purple, and it does not fade as the day goes on. Our formula uses non-nano zinc oxide at 16%, and at that level an untinted version leaves a visible cast on a lot of people. We say so on the product page.
The honest fix is tint
There are two ways around the cast. One is to use less zinc and lean on other filters. We wanted a mineral-only formula, so that was out. The other is to offset the white with pigment.
Iron oxides are the mineral pigments used in foundation. Blended into a zinc sunscreen in the right proportion, they cancel the white, so the product disappears into the skin instead of sitting on it. They do something else useful: iron oxides add protection in the visible-light range, which zinc alone does not cover.
One tint cannot work for everyone, which is why there are three shades: Untinted, Light–Medium and Medium–Deep. In our two-week consumer-use study, 30 of 33 participants with medium to deep skin tones agreed that their tinted shade left no visible cast. That is 91%, and it also means three people disagreed. A fourth shade is the request we hear most.
Why sunscreens pill
Pilling is what happens when a product forms a film that does not bond to what is underneath, and the next thing you rub on rolls it up. Thick layers pill. Products applied before the previous one has set pill. Silicone-heavy primers over water-based sunscreens pill.
Part of the answer is in the formula: ours is a fluid rather than a cream, with squalane, and it sets to a satin finish. In the same study, 88% of participants who wore makeup daily agreed it did not pill. The other part is how you put it on.
How to apply it
Shake the tube
Mineral filters settle. If the first squeeze looks oily, it needed shaking.
Measure it
Two finger-lengths of product for the face and neck. Less than that and you are not getting the SPF on the label.
Two thin layers
Apply half, spread it, then apply the rest. Two thin layers set better than one thick one.
Pat, then leave it
Press it in rather than rubbing in circles, and give it a full minute before makeup.
Reapply
Every two hours of direct sun exposure, and after swimming, sweating or toweling off.
What it does not claim
The label says SPF 46, broad spectrum. It does not carry a water-resistance claim, so we do not make one. Swimming and sweating take sunscreen off any skin, and after either, the answer is to reapply.
No sunscreen blocks everything. Shade, a hat and the time of day still matter, especially on the morning after an acid.
Taking it off
Mineral sunscreen is meant to stay put, so it needs a proper cleanse in the evening. The Gel-to-Milk Cleanser removes it in one pass. If you wear makeup over it, start with the Micellar Prep Water.
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Micellar Water
Micellar Prep Water
A first cleanse for heavy makeup nights. No alcohol, no fragrance
From $26
