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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.

This case report describes a unique instance of keratoacanthomas developing within a red ink tattoo on a 51-year-old male, eight years after tattoo placement, and highlights the importance of monitoring for these lesions in tattoos, particularly red ink.

This study reports the development of a natural hair-coloring system using size-controlled ink particles from cuttlefish ink combined with chitosan, achieving darker and more uniform black coloration on hair than existing plant-based natural colorants, without the need for metallic mordants.

This research found that modifying brachytherapy seeds with contrast-enhancing materials in photoacoustic imaging increased signal-to-noise ratios and imaging depth, and demonstrated potential for tissue differentiation by analyzing temperature-induced changes in PA intensity.

Results are not reported for this study exploring how herbal hair dye, made from natural plant-based ingredients, might promote glossier, longer, and thicker hair while covering gray.