In art and literature, in history and popular culture, blonde has never been a mere colour. For 2,500 years, it has been a blazing signal and around this obsession entire industries have developed, influential trends set. From Greek prostitutes mimicking the golden-haired Aphrodite, to the Californian beach babe; from pigeon-dung and saffron dyes to L'Oreal - because you're worth it - we see the lengths to which women will go to become blonde. The power and duality of the blonde as either erotic symbol or saintly virgin waxes and wanes but never disappears. Weaving a story rich in anecdote,...