FIGURE 4 . Relative changes (expressed as % of intact skin value) of epidermal (a,b,c) and dermal (d,e,f) scattering coefficient\(µ_{s}^{\text{epi}}\) and \(µ_{s}^{\text{der}}\), caused by thein vivo skin optical clearing protocol as a function of time (OA – oleic acid; PG - propylene glycol; PEG - polyethylene glycol; DMSO - dimethyl sulfoxide). Standard deviation bars were removed to keep data legible.