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TESTING SUNSCREENS USING SUNLIGHT AND PHOTOGRAPHY *
Author(s) -
KAHN GUINTER,
WILCOX GEORGE,
WHEELER BILLIE W.,
ATCHISON WILLIAM
Publication year - 1969
Publication title -
british journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.304
H-Index - 179
eISSN - 1365-2133
pISSN - 0007-0963
DOI - 10.1111/j.1365-2133.1969.tb15932.x
Subject(s) - sunlight , densitometry , photography , optics , sensitivity (control systems) , light sensitivity , materials science , environmental science , blue light , optoelectronics , medicine , physics , art , visual arts , engineering , electronic engineering
SUMMARY.— A method to evaluate sunscreens in vitro is described. It employs light, photography and densitometry. The measurements are compared and analysed with the assurance that an equal amount of light bombards the sensor for an equal length of time, passing through a uniformly spread barrier of sunscreening material, to a film of uniform spectral sensitivity. The protection provided from mid‐day sunlight and artificial erythemal light by 9 agents is compared and correlated.