Tech Ingredients did a video about it as well. www.youtube.com/watch?v=dNs_kNilSjk

The biggest problem with making stuff white and using fancy materials is the amount of crap they get exposed to.

Moisture is one issue, both in the form of water vapor / condensation as well as rain. But there’s also smallish animals, like birds and cats that crawl around on roofs. Not to mention all the insects. Then there is the normal sand and dust in the air, plus all the pollution. Depending on where you live, white stuff gets really dirty within weeks or months.

I work in a white office building and they have it cleaned with pressure washers twice a year, it takes a whole climbing team a good two weeks to clean the whole thing and it looks dirty again after a few months. And that’s just a white form of plastic (HPL) you can blast away on, without causing damage. With these fancy meta materials often they are really fragile and any damage undoes the special properties.