4 citations
,
June 2016 in “PubMed” Repeated dyeing and shampooing cause hair color loss and damage.
56 citations
,
January 1996 in “Journal of Forensic Sciences” Dye enters hair at the edges of cuticle cells and penetrates more from water than alcohol-based solutions.
69 citations
,
January 2002 in “Journal of biomedical optics” Dyes can penetrate human skin and hair follicles up to 1.2 mm deep and the sebaceous gland can store dye; Indocyanine Green lotion was made for safe dyeing and monitoring.
44 citations
,
April 2003 in “European journal of pharmaceutical sciences” Lipophilic dyes accumulate more in hair follicles when delivered with surfactant-propylene glycol solutions.
191 citations
,
November 1959 in “Annals of the New York Academy of Sciences” Hair and wool have complex microscopic structures with microfibrils and varying cystine content.