It was the beginning of what has been called the Great Male Renunciation, which would see men abandon the wearing of jewellery, bright colours and ostentatious fabrics in favour of a dark, more sober, and homogeneous look.
John Bull complains 'Look here, this dark horse you are trying to palm off on me is coming out in his true colours as soon as I begin to rub him down!'
This new genetic approach is also able to differentiate between some hair colours that are similar, for example, between red and reddish blonde, or between blonde and dark blonde hair.