While the colour changed regularly, the prime minister's voluminous bouffant shape never wavered. Not one strand of hair was ever out of place, that's for sure. "[Makeup artist] Stacey Holman experimented for weeks to find a method which would achieve the bouffant that Thatcher was so well known for," Hall said, recalling that they finally settled on an extensive process of dry baking and back combing, essentially destroying the hair structure in the wig.