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What if you could only see the world in UV?

Veritasium2 HN recommenders · 2019–2021
5.6M views · explainer · evergreen · Uploaded 2018-07-21

Veritasium shows what the world looks like through a UV camera. It covers how pigments absorb UV, how fluorescence works, and how UV imaging reveals sunscreen effectiveness and skin damage.

HN recommends it as a cool, eye-opening look at the hidden ultraviolet world, especially in sunscreen and vitamin D threads.

Everyday physics & science demosFundamental physics

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3 comments from Hacker News

@rjf722019 · in “Sunlight through glass does not provide Vitamin D”

Mildly amusing related aside from this. Because of this, glass is completely opaque in the UV spectrum. Looking at the world in UV [1] is quite interesting! Such a reminder that how and what we experience of the world is so largely a product of our physiological composition. What is perfectly transparent to us would be a great hiding place from the perspective of something that only saw in UV. [1] - [VIDEO]

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@hrnnnnnn2020 · in “Vitamin D, part 1: back to basics”

You need fancy lenses to do UV photography. From wikipedia: "For UV photography it is necessary to use specially developed lenses having elements made from fused quartz or quartz and fluorite." Veritasium has a video using a special UV setup, it's pretty cool - [VIDEO]

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@tasty_freeze2021 · in “The only skin care that works? science video response (2020)”

I'm in my mid/late 50s, and had grandparents from Ireland, that is, I'm light skinned. As a kid my brothers and I would compete who could peel off the longest continuous strip of skin a day or two after going to the beach. Anyway, the skin on my exposed arms looks like "old man" skin -- lots of blotches, and more importantly not elastic. However, the skin that lives under my short sleeves is not only unblemished, it is as elastic as when I was a teenager. In short: yes, it will help against cosmetic damage as well as skin cancer. Bonus: the youtube channel veritasium did a video a few years ago where they use a UV filter on a camera to show (a) the effectiveness of sunscreen and (b) the damage which is visible in the UV years before it shows up in visible light. [VIDEO]

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