- Which metal would be safest to apply to the hair if the scalp were to absorb any of the metal? Would it be Bismuth, silver or zinc oxide? Thanks!
A little background on my experiment … "Henna" (Lawsonia plant hair dye going way back to ancient times) used to be combined with metallic salts to cause it to adhere to the hair and make it thicker with cumulative use. In foreign countries "compound henna" is still being sold but often w/ harmful metals like lead as well as less harmful metals like zinc oxide. But, I want to combine it with the safest metal. Also, I understand that some metals make the hair dull (like iron) while others make hair shiny. Anyone have any clue which of the three metals - bismuth, silver or zinc oxide might yield the most shine to a strand of hair? Thanks for any input.