this post was submitted on 14 Nov 2023
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Ultra-white ceramic cools buildings with record-high 99.6% reflectivity::undefined

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[–] [email protected] 34 points 11 months ago (9 children)

Probably illegal here because of the high reflective value. Depending on the sun's position, it could dazzle and blind people, e.g. people driving cars or riding bikes. I know that for this reason, shiny metal roofs are not allowed.

[–] [email protected] 38 points 11 months ago (1 children)

There is a difference between mirror like reflection and diffuse reflection. Mirror reflection is what you get with metal roofs which beam the sun directly to a target resulting in one spot being blinded. Diffuse reflection will spread it around, resulting in more light all around which is what we can handle as humans.

[–] [email protected] 31 points 11 months ago (2 children)

Can mostly handle. Snow blindness is a thing, and that's all diffuse reflection too, not specular. But it's unlikely a roof would be such a problem.

[–] [email protected] 8 points 11 months ago (1 children)

The reason for snow blindness is the fact the snow fills such a high portion of the visual field.

[–] [email protected] 9 points 11 months ago

Yeah, hence it's unlikely a roof would fill it to the same extent and wouldn't be a problem.

[–] [email protected] 2 points 11 months ago

We have snow here

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