JOURNAL OF COSMETIC SCIENCE 364 The normality of variables for both Sp and Vis was established by the Henry’s straight line (Figures 2A and 3A, respectively), whereas the reproducibility of experiences was verifi ed by Cochrane criterion for which calculated value (0.367 and 0.364 for Sp and Vis, respectively) was below tabulated one (0.801 for the two responses). Figure 2. (A) Henry’ straight, (B) iso-response surface, and (C) response surface. Case of the spreadability (Sp) (cm2).
COSMETIC CREAM WITH AQUEOUS EXTRACT AND DATE FRUIT SEED OIL 365 Figure 3. (A) Henry’s straight, (B) iso-response surface, and (C) response surface. Case of viscosity (Vis) (Pa·s).
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