stearic acid exudate

Figure 10: (a): Photomicrograph detail of stearic acid exudate. (b): Cotton swab with bloom. (c): During treatment image after cleaning with mineral spirits (cleaned area indicated with red box). (d): ATR-FTIR spectral comparison: cotton swab with bloom (blue spectrum), clean, unused cotton swab (red spectrum) and stearic acid exudate collected from the PL goggle holder tab (green spectrum). Significant peaks match between the residue and the exudate are indicated in black boxes. Peaks that do not match with the exudate match with a clean cotton swab. Spectra collected with a 4100 ExoScan FTIR (handheld) Spherical Diamond ATR head.