Fast blue B salt, Fast red B Salt and benzidine/NaNO2 all stain the heartwood of Pinus sylvestris dark red. What is the mechanism behind this reaction? What is the target molecule for the stains?
By the way: Why is the carcinogenic benzidine/NaNO2 still used frequently while the Fast Blue B and Fast Red B salts are easier to handle and rather harmless?
I tried Pinosylvin and Pinosylvin-Monomethylether. Fast blue B salt lead to a fast and intensive red staining of Pinosylvin but not of Pinosylvin-Monomethylether. Both substances show an intense flurorescence when illuminated with UV 365 nm. Obviously the heartwood detection and the fluorescence and the staining of coatings over the heartwood of Pinus sylvestris with Fast Blue B salt is caused by Pinosylvin.
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