The false color SRS images of 40% drug loading films, together with the respec ve correla ve confocal reflec on images for the are presented on the right in Figure , as well as the corresponding coefficients plots at each me point (le ). Many of the same phenomena observed for the ASD film with 20% drug loading, were also observed at 40% drug loading, but they differed quan ta vely. The false color SRS image of the dry film (0 min) was an almost uniform shade of green, consistent with a single-phase homogeneous film richer in PVPVA than RTV, and the film-air interface was sharp. The green color was less rich than for the 20% drug loading, due to the larger contribu on of RTV signal (magenta).