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This review discusses various types of hair dyes, their mechanisms of action, molecular structures, application methods, and formulation aspects, but reports no new research findings.

Plant-based ingredients in hair care are being replaced by synthetic alternatives.

This source reviews historical works on cosmetics and healthcare from the Middle Ages to the Early Modern Period in Europe, highlighting the use of natural ingredients for aesthetic and medicinal purposes across various cultures, including Christian, Hebrew, and Muslim societies.

This study assessed the effects of chemical treatments on hair fiber integrity and found that conditioners with vegetable oils like jojoba and coconut enhanced hydrophobicity and reduced combing friction except for jojoba, while participants preferred these oil-containing conditioners over the base formulation.

This study introduced a new method for extracting red mordant dyes from wool fibers that preserved the fibers for further analysis and allowed for spectrophotometric examination of the dyes' absorption curves.