Completely confused ... I will give to the examination.
Thank you very much, apparently, without expert professionals can not do.
Added after 9 minutes
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Сообщение от Artem , 2452951 "
developed technology against the shedding of paintings and craquelure
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Paint peeling off . if they affect the well-preserved fruit of good conservation picture , sorry, that first layer , superimposed on the reverse side of the picture , something like a heavy paper impregnated , crumbled into dust . I put only two of author unknown to me . Others, more likely , are defined.