Treating hair with 1M sodium hydroxide increases its friction, making it better for small medical knots.
[object Object] 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.