3-D surface imaging. Thin organic films can be interactively imaged and manipulated to determine film thickness. This is a broad class of materials. Many possible sources. A major component of RTV silicone rubbers.
Vacuum pump oils.
Typically have a broad distribution of molecular weights. Organic Acid Salts. Typically from RTV accelerators and possibly from ethanol residue. Post-flight surfaces are generally cleaner. Window Surface Particles Flatfield Images.