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This study found that melanin granules in black human hair are key dyeing regions for oxidative hair coloring, as confirmed by nanoscale mass spectrometry analysis detecting deuterium ions.

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.

This study demonstrated that dyeing can enhance the absorption coefficient of hair follicle tissues for selective photodestruction within human skin and hair follicles.

This study using an apertureless scanning near-field optical microscope found that dye restricted to hair's periphery remains mainly on the surface and in the endocuticle.

This study found that while yak belly hair is chemically similar to human hair, its higher porosity and lower mechanical strength limit its usefulness as a substitute in hair dye development.

This study introduced a novel graphene-based hair dye that is non-reactive, non-invasive, and eliminates toxic chemicals, while providing durable color, antistatic properties, and efficient heat dissipation, even after 30 washes.

This study found that 1,2,3,4-tetrahydroquinoline derivatives, particularly N-methyl-7-amino-1,2,3,4-tetrahydroquinoline, may be excellent blue dye candidates for human hair, offering superior color purity, stability, and fastness compared to 2,3-dihydroindoles.

This study analyzed how oxidative hair dye leaches from pigmented and nonpigmented hair during wash cycles, finding that melanin influences the dye deposition and leaching processes.

This study examined how different hair dye processes affect hair structure at a molecular level, finding that oxidative dyes increase keratin porosity more than non-oxidative dyes, and highlighted emerging technology aimed at reducing hair damage while preserving color quality.

This study found that dyed chitin nanofibers maintain color and mechanical properties when reinforcing resins, allowing color addition and strength improvement while retaining transparency.

This study found that treating yak hair fibers with low-temperature plasma and microwaves weakened the scale structure and significantly improved dyeability.

This study found that adverse reactions to para-phenylenediamine in hair dye, including severe allergic contact dermatitis, may be more common than currently reported and often misdiagnosed.

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.

Hair dyes penetrate the scalp very minimally, less than 1%.

In this study, polydopamine emerged as a safe and effective alternative to traditional hair dyes like PPD for dyeing gray hair permanently, showing resistance to detergents and causing less toxicity and hair loss in mice.

In this study, hair damaged by permanent dye showed signs of recovery over time, with near complete restoration to its original state after eight weeks.

This study demonstrates that confocal laser scanning microscopy can effectively visualize the rapid diffusion and penetration pathway of a dye into the hair follicle in fresh human scalp skin.

This study of Danish women found no evidence linking hair cortisol concentration to hair dyeing status or the frequency of hair washing.

This study found that FM dyes are effective markers for tracing live Merkel cells in in vitro experiments, as they remain visible for at least seven days and highlight cell shape better than quinacrine.

In this study, higher concentrations of Pb, Cd, Cu, and Zn were found in the hair of smokers and users of hair dyes compared to non-smokers and those with undyed hair.

This review discusses the role of hair dyes in cosmetic dermatology, their effects on hair and scalp health, and the importance of dermatologists understanding potential side effects; it reports no new findings.

This case report describes a woman experiencing severe hair loss due to allergic contact dermatitis from a hair dye containing PPD.

This article recommends creating a system to educate users about the ingredients and side effects of hair coloring products and does not report new research findings.

This study found no evidence that the tested hair dye ingredients undergo hepatic metabolism to reactive oxidized metabolites in human liver microsomes and hepatocytes.

This study reports that the newly developed natural dye-based sindoor is safe for skin application and offers a non-toxic alternative to synthetic dye-based sindoor.

This study found that a non-ionic ethosomal carrier system significantly improved the delivery and adsorption of black tea extracts onto hair surfaces in vitro, suggesting its potential as a hair dye and protective agent.

Hair dye with para-phenylenediamine can cause skin depigmentation.

This study reports that a 100% herbal hair dye composed primarily of Cymphomandra betacea, Tagetes erecta, and Aloe vera gel provides permanent hair color without causing hair damage, loss, or skin irritation compared to synthetic dyes.

This study found that using henna dye positively affected hair cuticula pattern and diameters compared to undyed hair, though the degree of change may vary based on hair phenotype and condition prior to treatment.