138 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Q9 O.8 0.7 Q6 •'•'"---. • BLANK BLEA C H ,•0% INDEX OF BLEACHED HAIR 15 30 45 60 120 180 240 TIME IN MINUTES Figure 3.--20% Indexes obtained in water on hair bleached for various periods of time. The tests were run with a Constant Elongation Tester. INCREASE IN EXTENSIBILITY vs BLEACHINGTIME % IO 0 60 120 180 240 TIME IN MINUTES Figure 4.--Per cent increase in extensibility compared to bleaching time. Conditions are 75% R. H. and about 25øC. Results obtained with Scott Tester with constant rate of loading.
PROPERTIES OF PEROXIDE BLEACHED HAIR 139 TABLE 3.--PER CENT BREAKAGE AT 20% TABI.E 4. EXTENSION AT BREAK AT 75% EXTENSION IN ORGANIC SOLVENTS RELATIVE HUMIDITY
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