328 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 6. Mannequin used to compare ease of styling and style retention Upper le[t. Styled hair Upper right. 1 hr 75% RH Lower le[t. 2 rain slow shaking Lower right. 2 min fast shaking Initially, two-side styling comparisons involving personal use were made by arranging for 42 shampoo and hair sets at a Wilmington salon. Volunteers agreed to have one side styled with the lotion they or their beauticians had been using and the other by use of the new lotion. Lotions were placed in opaque bottles labeled under a code so that when comparisons were made no one knew which lotion was used on either side. As directed, the beautician simply used bottle A on one side, and bottle 13 on the other. Hair spray was eliminated to maximize differences in the effects of lotions. Salon work was done in the morn- ing. Observations were made that afternoon and each of the next 2 days. The user's and two observers' comparisons of the two sides were made separately and recorded for study without anyone having knowl-

POLYAMIDE RESINS FOR HAIR 329 Figure 7. Laboratory shaker used to evaluate style retention edge of another's comments. Observers did not know whether the same lotion had been used as a control test on both sides and were asked to comment on the styling knowing only that there might be a differ- ence. If a difference was reported, reasons for the preference were re- corded. Agreement by two of the observers was recorded as a prefer- ence. Usually the three were in agreement, though not always for the same reason. Preference results are shown in Table II and reasons given are summarized in Table III. Table II Comparison of Styling Lotions by Use of Two-Side Stylings at Wilmington Salons No. of Test Side Preferred Subjects Polyamide lotion 33 Comparator lotion 5 Both the same 4 -- Total 42