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Related Experiment Video

Updated: Mar 14, 2026

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
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Skin Colour Does Not Define Ethnicity: Quantifying Variation and Overlap Across Diverse Populations.

Yan Lu1, Kaida Xiao1, Changjun Li2

  • 1Leeds Institute of Textile and Colour, School of Design, University of Leeds, Leeds, UK.

Skin Research and Technology : Official Journal of International Society for Bioengineering and the Skin (ISBS) [And] International Society for Digital Imaging of Skin (ISDIS) [And] International Society for Skin Imaging (ISSI)
|March 13, 2026
PubMed
Summary

Human skin colour shows high variation within groups and significant overlap between them. This challenges its use for defining ethnicity, highlighting the need for data-driven classification systems for human variation.

Keywords:
CIELAB colour spaceISSAethnicityperceptual overlapskin appearanceskin colourskin colour variationskin gamut

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Area of Science:

  • Anthropometry
  • Human genetics
  • Population studies

Background:

  • Skin color is a key human trait historically linked to ethnicity.
  • Its reliability as a classification tool for ethnicity is questionable.

Purpose of the Study:

  • To quantitatively analyze skin reflectance data to assess ethnic group overlap.
  • To evaluate the validity of skin color as a sole determinant of ethnicity.

Main Methods:

  • Analysis of over 14,000 skin reflectance measurements from the International Skin Spectra Archive (ISSA).
  • Utilized a standard color space modeling human visual perception.
  • Assessed intragroup variation and intergroup overlap using individual perceptual differences and group gamut volumes.

Main Results:

  • Within-group variability in skin chromaticity and lightness often surpasses between-group differences.
  • 89.4% of samples had perceptually indistinguishable counterparts across ethnicities.
  • A median shared gamut overlap of 60.5% between groups indicates substantial overlap in skin color distributions.

Conclusions:

  • Skin color displays high within-group dispersion and extensive between-group overlap.
  • Findings question the use of skin color as a reliable ethnicity indicator.
  • Emphasizes the continuous nature of human skin variation beyond simplistic ethnic categories.