Diffusion coefficients of Rhodamine-6G dye (R6G) through the different phases of BBOA (DR6G) were measured using rectangular Fluorescence Recovery After Photobleaching (rFRAP) . Briefly, films of sampled BBOA with additional trace amounts of R6G were imaged using a confocal laser scanning fluorescence microscope, and a central rectangular region was photobleached. The RHdependent diffusion coefficient of R6G was calculated from the timescale through which the fluorescence intensity within the bleached region recovered, arising from diffusion of the dye through the BBOA film. This is described in more detail in the Supplementary Materials section (Section S3.2). The diffusion coefficients of R6G were then used to calculate the viscosity of the BBOA phases using the Stokes-Einstein relation .