White colored and UV

[kenny1999]

Does white colored object actually reflect all UV so that it is free of being attacked by UV?

or is it also attacked and dyed by UV but since it's white you can't see the effect?

Another question is we know that white clothes is cooler in the summer than black clothes, is it because most light is reflected by white color?

[exchemist]

56 minutes ago, kenny1999 said:

Does white colored object actually reflect all UV so that it is free of being attacked by UV?

or is it also attacked and dyed by UV but since it's white you can't see the effect?

Another question is we know that white clothes is cooler in the summer than black clothes, is it because most light is reflected by white color?

White objects do not absorb , or not much, in the visible region of the spectrum. But UV, as the name implies, lies outside that region. So visible colour is no guide.

White clothing absorbs less visible light, which indeed makes it heated less by sunlight.

[John Cuthber]

Titanium dioxide, which is a very popular white pigment, absorbs UV rather well.
https://www.researchgate.net/figure/UV-Vis-Diffuse-reflectance-spectrum-of-bare-TiO-2-nanoparticles_fig6_320324473

Plain cellulose (and therefore, cotton) doesn't absorb near UV but it does scatter or reflect it.

https://www.researchgate.net/figure/UV-Vis-diffuse-reflectance-spectra-of-pure-cellulose-a-cellulose-film-with-stamen-like_fig3_319232616