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Effects of age on the structure and bleaching/dyeing behaviour of hair
Author(s) -
Wang Haona,
Kong Li,
Xia Honghui,
Huang Jie Min,
Deng Bo,
Pan Heng
Publication year - 2021
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/cote.12525
Subject(s) - dyeing , lightness , melanin , hydrogen peroxide , scanning electron microscope , materials science , chemistry , transmission electron microscopy , composite material , food science , pulp and paper industry , nanotechnology , optics , biochemistry , physics , engineering
Abstract The structure and bleaching/dyeing behaviour of hair sampled from people of various ages were investigated to provide guidance for wig‐making. Hair surface and cross‐sectional morphology were investigated by scanning electron microscopy, whereas the number density and size of melanin granules were evaluated by transmission electron microscopy. The suitability of hair for dyeing was determined by the trade‐off between the fracture strength and lightness of bleached samples. Hair collected from 26‐year‐olds showed the highest number density and the lowest size of melanin granules, thus featuring the lowest mechanical strength reduction and the highest lightness increase after bleaching. The optimal bleaching conditions for such hair were identified as bleaching time = 80 minutes, hydrogen peroxide (H 2 O 2 ) concentration = 60 mL/L, and bleaching temperature = 75°C. Considering its resilience to damage and favourable dyeing behaviour, hair sampled from 26‐year‐olds was concluded to be most suitable for wig‐making. Thus, the present research provides guidance for the selection of raw materials for wig‐making.