Eucalyptus ash alters secondary protein conformation of human grey hair and facilitates anthocyanin dyeing
Fig 6
(A) Average CIE Lab colorimetric data of grey hair (across 50 shafts/measurement, n = 3) 1-h treated with water (clear columns), ash extract (light grey columns), dye solution (dark grey columns) and ash extract followed by dye solution (black columns), 1 h for each treatment and (B) overall color difference (DE*) of each treatment, calculated by Eq (2); L* = darkness(0)/lightness(100), a* = green(-)/red(+) and b* = blue(-)/yellow(+).