The image on the upper left show distinctive colors.

The upper right image of the plate shows a bright green fluorescence because of a fluorescent indicator embedded into the silica plate, which facilitates viewing how the substances traveled on the plate. The image is a composite of four, at the top the plate before it was treated with sulfuric acid, at two different wavelengths of UV light. The image below is one single plate with 13 lichen extracts (the lines numbered 13-25). The metabolites also have different colors in visible and UV light of different wavelengths, and these colors differ before and after treating them with sulfuric acid and heat. Some have a stronger affinity to a particular solvent, these secondary metabolites travel faster than others. These extracts then can be placed on a silica coated glass plate, a solvent migrating through the silica will drag along the secondary metabolites. Lichens have complex secondary metabolites that can be extracted with acetone. Recently it occurred to me that there might be another use of PSU, to manage my collections of images of thin-layer chromatography plates. It is great to manage the images of the specimens that I collect. I managed to convince Hert to have PSU natively support the DarwinCore as XMP. People who occasionally read my posts here on the forum probably know that I am using PSU to manage my large collection of images of lichens.

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