This story is part of the October 12 edition of Sunday Life. See all 14 stories .

For as long as I can remember, the stylish Olsen twins – Mary-Kate and Ashley – have been our girl crushes, both for their boho style and long blonde locks. The 39-year-olds have worked with stylist Mark Townsend for more than 20 years. He helped them pioneer their signature “air-dried” look on the red carpet, including at the Met Gala, which they have attended on and off since they were 18.

The first stage in achieving their perfectly tousled hair is to nail the colour. It all begins with the exquisitely under-polished “Olsen dip” colour treatment, which ranges from mid-brown to platinum blonde. Getting this look requires a root smudge, in which your hair stylist goes back over freshly coloured hair a

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