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Related Experiment Video

Updated: Aug 12, 2025

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In vitro hyperspectral analysis of tattoo dyes.

Anna Stolecka-Warzecha1, Łukasz Chmielewski2, Sławomir Wilczyński1

  • 1Department of Basic Biomedical Science, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia in Katowice, Sosnowiec, Poland.

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)
|January 27, 2023
PubMed
Summary

Understanding tattoo dye spectral characteristics is key for effective laser removal. This study analyzed in vitro dye properties to optimize laser treatments for tattoo and permanent makeup removal, finding black dye

Keywords:
hyperspectral analysisradiation reflectancetattootattoo dyetattoo removal

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Area of Science:

  • Dermatology and Biomedical Optics
  • Photonic Science

Background:

  • Current tattoo and permanent makeup removal methods lack guaranteed effectiveness, speed, and noninvasiveness.
  • Laser treatments are the preferred method, but require optimization for different tattoo dyes.
  • In vitro spectral analysis of tattoo dyes is crucial for enhancing laser removal efficacy.

Purpose of the Study:

  • To determine the in vitro spectral characteristics of common tattoo and permanent makeup dyes.
  • To analyze these spectral properties for optimizing laser treatment parameters.
  • To improve the safety and effectiveness of noninvasive tattoo removal procedures.

Main Methods:

  • Hyperspectral analysis was employed to assess dye spectral characteristics across the 400-1000 nm range.
  • Seven different permanent makeup and tattoo dyes were analyzed in vitro.
  • Visible light imaging was used to determine optical properties and reflectance patterns.

Main Results:

  • Maximum radiation reflectance varied between 634-732 nm for the tested dyes.
  • Dyes with visually similar colors exhibited significant differences in maximum radiation absorption wavelengths.
  • White and yellow dyes showed the highest reflectance, while black dye had the lowest, indicating safer and more effective removal.

Conclusions:

  • Image analysis in visible light can identify radiation absorption homogeneity.
  • Optimizing laser wavelength based on maximum dye absorption/reflectance enhances tattoo removal effectiveness.
  • Spectral characterization provides a pathway to safer and more efficient laser tattoo removal.