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Retzius and Fürst defined brown hair similar to Virchow including dark brown to chestnut shades clearly not black but also not fair. Linders and Lundborg used a real hair scale only correlated with the Fischer scale. Norway is one of the most comprehensively surveyed countries in Europe due to the efforts of Halfdan Bryn and Kristian Schreiner. In Aust-Agder the blondest district in Bryn‘s investigation 66.7% (https://books.google.com/books?id=dc...%C3%BC%C3%9Fte) Fischer #9-26 was observed among recruits. It can thus be generalized that the highest frequency of true blonds ranging from the darkest to lightest golden/ash shades in any population of young adults is around 2/3rds. In Sweden it wouldn’t run any higher.
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