REDUCING FACIAL WRINKLE SIZE USING POLYMERS 139 The data in Figure 8 shows that the formulations which produced a tightening sensation were also the most tacky. Four percent AMC was rated signifi cantly higher than the benchmark and the placebo for tacky feel during application, tacky feel during drying time, and tacky feel after drying. The 2% AMC formulation was also rated signifi cantly higher than the benchmark and placebo for tacky feel during drying time. However, although these formulations were rated higher for tackiness, consumer accep- tance was still high. With the exception of 4% AMC during application, a signifi cant majority (p  0.05, 75% or more of respondents) found the tacky feel of the products to be acceptable. Figure 5. Ch ange in skin curvature area and curvature density on the cheek area measured by AEVA analy- sis. A decline in curvature indicates lower visibility of fi ne lines. There are no signifi cant differences between treatments ( p 0.05). Treatments denoted with * are signifi cantly different from baseline (no treatment) ( p  0.05). Figure 6. Chan ge in wrinkle topography as reported by the AEVA software as total detected wrinkle area and volume. Treatments denoted with * are signifi cantly different from baseline (no treatment) (p  0.05). The data show that total wrinkle volume decreased signifi cantly for skin treated with the 2% AMC formula- tion. There are no signifi cant differences between treatments (p 0.05).

JOURNAL OF COSMETIC SCIENCE 140 DISCUSSION PRODUCT IMPACT ON SKIN DURING APPLICATION In this study, we analyzed the impact of product formulations containing skin care poly- mers on the skin surface. For the polymers studied, the formulation was somewhat tacky on initial application, but became less tacky as it dried and the tackiness of the skin was Figure 7. Consum er perception of skin feel and appearance after application of the test formulations. Sub- jects were asked to rate their responses on a scale from 1 (not at tightened/smooth) to 6 (extremely tightened/ smooth) for the fi rst three questions. Treatments denoted with different letters are signifi cantly different from each other within the same question (p  0.05). Figure 8. Consumer perception of tacky feel of the test formulations. Subjects were asked to rate the tacky feel during three stages of the application process on a scale from 1 (not at all tacky) to 6 (extremely tacky). They were also asked if the tacky feel was acceptable (yes or no response). Treatments denoted with different letters are signifi cantly different from each other within the same question (p  0.05).