Figure 5

Diffuse reflectance reduction of human skin at 580 nm.
Reduction in diffuse reflectance at 580 nm for human skin after treatment with (a) S1 and S1@A, (b) S2 and S2@A, (c) S3 and S3@A, and (d) S4 and S4@A at 20, 40, 60 and 80 min, respectively.