Canvas
 

Distinguished experts help determine the approximate age of the canvas to which years he treated.
I express my thanks to all in advance.

How lovely.

Paleozoic?

Paleozoic?

End of the Century.
Then tell what.

Maybe it's a "check for lice?"
After all, who gave a definite and unequivocal answer to this query, you can safely put the number 1 in the list of notorious quacks

By the time impossible to say.

Chances are hand-woven canvas.

Soviet weave younger you valentin1967, if you are born in '67 . Sticks in canvas ( remember this lap ) and the paint has passed through, indicating that the poor sizing and dirt - probably academic work or work of non-professional artist 70s - 80s .

 
Could you specify where and when they saw this lap .

So, the game takes a charlatan number 1.
Weaving is neither the "Soviet" or "monarchic" or "Republican" (as it is not "Russian", "French" or "German").
Weaving, forgive the banality happen: direct (linen), mixed and twill. (There are several other varieties, but for the current song they have no relationship).
In this case: plain weave, 1 x 1 (one weft thread on one warp yarn).
Weft and warp yarns - are uneven in thickness, there are profound defects as spinning and weaving character: high grade of quality fibers (although the definition of "sticks in canvas" I also really liked the <! - ~ 7 ~ ->), uneven twist , thickening fibers, discharge etc, etc, etc.
In short: a canvas - a cheap, loose, NOT artistic, close to sacking (by the way, in the XIX century in Russia on the same production were woven and canvas and bag).
But even if I give this canvas a dozen definitions, to date his pictures would still be impossible. (Well, unless someone in the chest is not stored "assortment book" Noginsk factory Holt and bags or Havre Yamskogo flax over fifty - sixty) ...