134 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS (c) -... .. .3.:'.. .-
PERCLTANEOUS ABSORPTION AND SURFACE ACTIVE AGENTS 135 :! --%'•. •:• .:. . •: .2 • ß ...... ?.'7." Figure 1.--Skin photographs of guinea pigs after the second stage of the two stage multiple application procedure. Treatments were with the following preparations: (a) 0.5% NiSO4 alone--no skin irritation. (b) 0.50/0 Na lauryl sulfate (NaLS)--no skin irritation. (c) 0.5% NiSO4 plus 0.5% NaLS--eczematous reaction. (d) 0.5% NiSO4 plus 1.0% Igepon A--no skin irritation.
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