Sunscreen: read the label and use it well

Beginner · SESH Academy

Distinguish SPF from broad-spectrum protection and understand application, reapplication and shade.

Locate ultraviolet and visible light within the spectrum. This is not a sunscreen protection test; protection must be assessed from product data and testing.

Locate ultraviolet and visible light within the spectrum. This is not a sunscreen protection test; protection must be assessed from product data and testing.

Image source · NASA / STScIPublic domainCompressed display copy; illustration content retained.
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What you will learn

Distinguish SPF from broad-spectrum protection and understand application, reapplication and shade.

Core ideas before application

Does SPF 50 mean 50 hours of protection?

No; it is a protection test value, not hours. Amount, coverage, reapplication and use conditions affect real protection.

What does broad spectrum mean?

Protection against UVA and UVB. The term describes the radiation range, not water-resistance duration.

A realistic long-term skincare plan — a published visual reference for the topic, not SESH product-test data.

A realistic long-term skincare plan — a published visual reference for the topic, not SESH product-test data.

Image source · Andrew SteeleCC0Existing Academy display copy.
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After swimming and towelling, what should you do?

Reapply as directed. Water and rubbing can remove product; follow reapplication directions.

Why avoid mixing sunscreen into foundation?

To preserve an even application film. Mixing makes sunscreen distribution and protective amount harder to assess.

Explore the full curriculum in SESH Skincare Academy.

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