I myself would not give up this solution, which kapnul - and dating in your pocket.
But seriously, this is a very delicate matter - dating painting, because set of pigments in 18 th century France and the first half of 1919 will be approximately the same, and the connection is likely to be, natural oil (linseed, poppy, nut, etc.).
On the degree of polymerization of colors, too difficult to separate the 200 years from 250.
If this is a copy, it is easier to take pictures in the infrared spectrum and check authenticity figure.
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