[QUOTE="Artem; 1402701]This is where it is written?[/QUOTE]
Well, somewhere says, look, I do not remember what book I read this.
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About the stretcher I liked this explanation:
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Сообщение от OlegTsi
I think I see traces of a paper that was glued around the perimeter of the back side of the frame. If so, it protected the back of the picture of the impact of external factors. The dust did not penetrate to any front or rear sides. Stretcher itself (if it is pine) has acquired a natural reddish tint. And yet, is very important factor in saving (constant relative humidity and temperature), and the degree of care for the picture.
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