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My memory is failing! I have what is suspected to be a very old watercolor discovery. very exciting. however, I am not that familiar with identification of old watercolor. I know that the real deal Vaseline Glass glows a brilliant florescent yellow.(have some) Also the uranium in the old marbles glow. The newer chemicals in the modern glue glow in newer repairs on glass,porcelain,etc. but please help me out on this, so I don't get it backwards. Old oils, and acrylics , the paint glows or not?? can't remember. AND the biggy in question - HOW DOES 100 year old watercolor, and paper supposed to show under ultra violet-black light??