Differentiation between inks of the same brand by infrared luminescence photography of their thin-layer chromatograms.
D002855:Chromatography, Thin Layer / Q000379:methods; D003415:Crime; D005382:Financing, Personal; D005607:Fraud; D006801:Humans; D007259:Infrared Rays; D007281:Ink; D008163:Luminescent Measurements; D008297:Male; D010781:Photography / Q000379:methods