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The Science Behind Rare Red Hair Shades and the EN31 Classification Explained for 2026
"The term EN31, often surfacing in professional colorist forums and hair industry databases, refers to a specific technical color code used to categorize specialized, high-intensity copper-red pigments. This guide clarifies the genetic rarity of natural red hair shades and the professional application of the EN31 classification system in modern hair science. Understanding the Rarity of Natural Red Hair Genetics Natural red hair is the rarest hair color globally, accounting for approximately 1 to 2 percent of the human population. This phenotype is primarily driven by mutations in the MC1R gene located on chromosome 16. In 2026, genetic researc..."
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