PHOTOMICROGRAPHIC TECHNIQUES FOR HAIR 95 .. .... ß ' ß ,•..,,,..c. :•,,,. .... "" ' -:"?' . .... ß ..... :.:.. -.•,, ':Y :'/' "" .....,•: .:•"•:' ' '•. ... ............ -:. Figure 14.--Cross section of child's head hair showing medullas. 500X magnification. :. .... .. Figure 15.--Cross section of female child's head hair which is almost perfectly circular. magnification. i 500X carried out. The principal applications for stains are in studying injuries to fibers, in identifying fibers and in studying the growth, biology and morphology of fibers. Keratinization, for example, has been studied extensively by histological methods.
96 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS . Figure 17.--Cross section of adult male beard hair, same subject as Figure 16. 310X magni- fication. It is not intended, in this paper, to discuss these subjects. However, there is a relatively new subject in which staining of fibers may be of imp. ortance. A few years ago, Mercer (10) and some Japanese investi- gators (11), working independently, showed that crimped wool was made
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