How Hair Works
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Hair and pH: Weakly Acidic Is the Baseline, Alkali Makes It SwellHealthy hair is weakly acidic at pH 4.5–5.5. After coloring o...
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Keratin and the "Three Bonds": Why Hair Frizzes in Humidity and Why Its Shape ChangesHair keeps its shape thanks to the hydrogen, salt and cystine...
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Hair Has Three Layers: Cuticle, Cortex and MedullaThe cross-section of a hair has three layers, from the outsid...
