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Robert Louis Stevenson had brown hair.
He had red/brown hair.
he's blonde
King Juan Carlos I of Spain has brown hair.
In paintings on an image search, he has brown hair.
Bright orange and purple
Black and white
Reddish-Brown.dark brown
Probably it had to do with his hair colour.
Emma Roberts natural hair colour is a light brown i guess you would call it dirty blonde.
There is no universal "sexy" hair colour. Hair colour is a personal preference. Your hair colour should be a similar shade to your eyebrows and should compliment your eyes. Ask a professional hair stylist what colour suits you.
Hair colour is continuous because there is a continual range of values when it comes to hair colour