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The HLB values were estimated experimentally by the Griffin method . The composition of the emulsion during the evaluation of HLB was as follows: oil phase (paraffin oil/paraffin wax, 9:1 w/w): 40 wt%; water: 55 wt%; emulsifier: 5 wt%. As a standard Tween 60 (HLB = 14.9) and Span 60 (HLB 4.7) emulsifiers were used. The confidence interval of the HLB values was 0.1.