Her hair is a reddish-brown colour.

她的头发是棕红色的。

《牛津词典》

Brown is the colour of a Barbie doll's hair.

棕色是一个芭比娃娃头发的颜色。

youdao

In Guangzhou the colour of the people's hair is all black, but in Northern Ireland there are many colours; brown, red and blonde but not black.

广州人的头发都是黑的，而北爱尔兰人的头发有很多颜色，有棕色，红色，浅褐色，但没有黑的。

youdao

They could estimate with an accuracy of more than 80% whether a person's hair colour was blonde or brown.

BBC: Hair colour predicted from genes

On average, their prediction accuracy was 69.5% for blonde hair, 78.5% for brown, 80% for red and 87.5% for black hair colour.

BBC: Forensic test can predict hair and eye colour from DNA

Oldman is sporting a pink shirt, his Commissioner Gordon moustache (he is currently filming the latest Batman movie, The Dark Knight Rises) and a pair of heavy-framed, light brown glasses, which match the colour of his hair.

BBC: Gary Oldman's Smiley: 'A little sexier, a little crueller'