Why does sunscreen leave a white cast?

What do we actually mean whenever we talk about a white cast?! When people talk about a white cast or white film with sunscreen, they mean the white or whitish-shimmering layer that settles on the skin. The white film usually appears with sunscreens that use mineral (physical) UV filters.
Why you should avoid chemical UV filters – not just for your own sake but for the environment's too – you'll find in our blog article "What does sunscreen actually have to do with corals?"
Mineral UV filters work much like a mirror on your skin. The tiny particles like titanium dioxide and zinc oxide in the sunscreen sit on your skin and reflect the skin-damaging sun exposure. A bonus over sunscreens with chemical UV filters: a mineral sunscreen protects you straight away, since it doesn't have to sink in to take effect.

Our Naseweiss also works with mineral UV filters, but leaves barely any white cast. To get good sun protection, you should apply a generous layer. You can then rub it into your skin. What's left is a barely noticeable white film. Only on heavily haired parts of the body can a somewhat whiter residue remain, since cream often gathers on the hairs.