13 citations,
January 1995 in “Journal of the American Institute for Conservation” Researchers developed a less damaging way to extract red dyes from wool using EDTA and DMF, preserving the fiber's strength for further analysis.
66 citations,
February 1985 in “Archives of dermatological research” Hair dyes penetrate the scalp very minimally, less than 1%.
44 citations,
April 2003 in “European journal of pharmaceutical sciences” Lipophilic dyes accumulate more in hair follicles when delivered with surfactant-propylene glycol solutions.
21 citations,
October 2014 in “Actas dermo-sifiliográficas/Actas dermo-sifiliográficas” Hair dyes can change hair color temporarily or permanently but may cause side effects like skin reactions and hair damage.
16 citations,
October 2009 in “Xenobiotica” The tested hair dye ingredients do not form harmful oxidized metabolites in the liver.