72 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 90 30 •0 0 050 10 20 30 40 TIME (HOURS) 7o • 5o _• •o o• FORMULATION E1 FORMULA TION E2 ß RESIN E FORMULATION D1 RESIN O Figure 7. Curl Retention Analysis--Set II--Average curl retention (per cent) as a function of time (hours) for 2 per cent solutions of Resins D, E and Formulations D1, El, E2 at 90 per cent R.H., 22øC 20 RESIN A RESIN 0 10 20 30 40 50 60 70 80 90 100 110 120 TIME (MINUTES) Figure 8. Twist Retention Analysis--Set I--Average Twist Retention as a function of time (minutes) for Resin A, B, C, D, and E at 90 to 93 per cent R.H., 21 to 25øC, and 2 per cent fixative solids (0.19 per cent pickup)

EVALUATION OF HAIR FIXATIVES 73 CURL RETENTION ANALYSIS--SET I Resins A through E were evaluated by Curl Retention for 21 hr. Fourteen replicates were used to insure maximum statistical significance. Plots of average curl retention (per cent) versus time are shown in Figure 6. CURL RETENTION ANALYSIS--SET II Resin D, E and Formulation D1, El, E2 were evaluated by Curl Retention for 21 hr us- ing 7 duplicate samples. Plots of average curl retention (per cent) versus time are shown in Figure 7. TWIST RETENTION ANALYSIS--SET I Resins A through E were evaluated by TRA using 2 per cent resin solutions. The results from 5 replicates were averaged and plotted against time (Fig. 8). TWIST RETENTION ANALYSIS--SET II Resins D, E and Formulations D 1, E 1 and E2 were evaluated by TRA using 2 per cent resin solution. The results from 2 replicates were averaged and plotted against time (Fig. 9). 90 80 70 3O 2(•- i - X ION E1 F O R M'""•M UX•L L A E2 FORMULATION D1 20 40 60 80 100 120 TIME (MINUTES) Figure 9. Twist Retention Analysis--Set II--Average Twist Retention as a function of time for Resins D, E and Formulations D1, El, E2 at 90 to 93 per cent R.H., 21 to 25øC and 2 per cent fixative solids (0.19 per cent pickup)