Uranium235
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When one speaks of a work, many think of literature, although in reality, it could be a painting, a film, or a sculpture, or even an invention. This is a common mistake, well-known to experienced players.
So, the work is quite old, as in modern times, fashion is so changeable that comparing it to current trends would be inappropriate.
In this case, I would go with a painting; in 2007, it was X-rayed, and they discovered what was painted in the lower layer.
Another option is that a draft or sketch was unearthed, but this is less likely, although literature and sculpture are still possible in that case.
A film is unlikely in this context.
So, the work is quite old, as in modern times, fashion is so changeable that comparing it to current trends would be inappropriate.
In this case, I would go with a painting; in 2007, it was X-rayed, and they discovered what was painted in the lower layer.
Another option is that a draft or sketch was unearthed, but this is less likely, although literature and sculpture are still possible in that case.
A film is unlikely in this context.