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Often you can tell in person if the person is a natural blonde. I am and my hair dresser tells me while natural blondes have more strands of hair on their head, it is finer. So when a 'dirty blond' (blond's hair darkens a bit comparatively as they age, but are still very blond compared to brunettes etc.) gets lighter highlights or bleached then they look blond naturally. However brunette's hair will not be as fine and when even a hint of roots come in you can tell not only because of the color, but the comparative coarseness that they are not a natural blond.

Also light and shadows falling on blond hair and days gone with out a wash (the oils settle on the hair to give it a darker appearance) can register a bit darker color in pictures. You can also often tell by skin color if the woman is a natural. Much of this is hard to decipher in pictures.

Elin is clearly a natural blond (although she may get highlights to enhance the lightness especially now after the children.)

My guess is that Kate Moss is a brunette.

I’ll say more but....take a better look at Elin. She definitely shows dark roots in some photos. Blond hair is made of thinner individual hairs but coloring it thickens it. Sometimes to point of the hair plating together and sticking together. Elin shows this too (from my looking at her)