Treating hair with 1M sodium hydroxide increases its friction, making it better for small medical knots.
January 2023 in “Медицинский вестник Северного Кавказа” The patient with Hoffman's folliculitis got better with the right treatment, leading to hair regrowth.
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September 2017 in “Colloids and surfaces. B, Biointerfaces” Tying a knot can measure hair friction, useful for medical applications.