In my opinion, it is simply oversubscribed work, Chem. examination will not change anything, it can only indicate that the layer of paint and canvas or older, or younger than the expected date. And even if it coincides with the assumption that this proves not opravergnit authenticity.
Assuming that this sketch, then why sign it once it is either a working version, or not finished.
In any case, the authenticity of the painting can argue ad infinitum, and lead, different argument: the less successful work, but the author, not a finished sketch it.d. Commercial values it represents, not for katolozhnyh sales of such work packs sold, and the more it raises doubts.
Then leave it to your court, but she does not convince me.
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