research Copper in Green Hair: A Quantitative Investigation by Electron Probe X-Ray Microanalysis 10 citations , January 1980 in “Ultrastructural pathology” Green hair has high copper levels due to contaminated water and damaged hair cuticles.
research Preliminary Studies for ^|^ldquo;Biomedical Analysis of Human Hair Exposed to Long-term Space Flight (Hair)^|^rdquo; Project: An Analysis of Trace Elements in the Hair January 2012 in “TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES AEROSPACE TECHNOLOGY JAPAN” Human hair can be used to study mineral changes from long-term space flight.