This study developed a natural hair dye using Coreopsis tinctoria Nutt. extract, finding that it produced yellow to dark brown colors depending on the treatment, with ferrous lactate enhancing dye performance and color stability after washing.
July 2024 in “Dermatology and Therapy” This study found that individuals with black hair have a significantly higher risk of alopecia areata compared to those with dark brown hair, while lighter hair colors like red or blonde are associated with a lower risk.
January 2007 in “Journal of the American Academy of Dermatology” A 73-year-old man's grey-white hair turned dark brown after eczema treatment.
March 2023 in “Journal of Cosmetic Dermatology” The researchers in this study described the use of trichoscopy to assist in diagnosing aplasia cutis congenita of the scalp in a dark-skinned newborn, noting that trichoscopic findings can differ from those seen in light-skinned patients, yet remain a valuable diagnostic tool.
September 2018 in “CRC Press eBooks” This review explores the trichoscopic features of dark scalp, particularly the brown honeycomb pigment network, and its variations in different types of alopecia, but it presents no new clinical findings.