No. Paintings prior to the 1900s. They can test the paints used. After the first detonations, there's isotopes that are unique to atomic detonation that permeate everything in small quantities now. Similar to DDT. Those old paintings do not have said isotopes. It's how they determine authentic from fakes for paintings from that era.
there's isotopes that are unique to atomic detonation that permeate everything in small quantities now.
If these isotopes permeate everything in small quantities, why don't they apply to older/prior paintings then?
Short answer: it does leave surface contaimination if not kept protected.
Long answer: The inks used have two give aways. First is the material used to make it, as materials in old inks and paints are VERY rarely used anymore. But in addition, when you test the medium itself, the isotopes are unable to penetrate that deeply. just dust level. So most art dealers will check medium comp. But for people who make sophisticed fakes, they test the actual isotope levels, because that cannot be faked. Due to how much of that stuff is in the world now, it's mixed into the paint regardless of what ingredients you use.
Source: Wife's old bosses dealt in art
Now this is Interesting because isotopes weren't only created on earth (bomb pulse), they are also coming from space (Miyake event & Suess effect) and have always been, since the creation of earth. (Supernovas and Sun)
Now regarding the paintings, What about micro cracks, don't they get deeper through them?
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