Most of books on wooden architecture published in the Soviet period are supplied with photos and, sometimes, with schematic patterns. And yes, most of the photos are black-and-white.
Of course it is a certain thing that B&W gives the best light-and-shade, that is, the best idea of the wood texture. Yet they might lead to conclusion that the houses were of that dull «wooden» color, ash-black and not painted at all.
Though the photograph from the book on the wooden architecture of the Gorkovskaya (now Nizhegorodskaya) Oblast published in 1955, tells us it was not always the case. Just imagine a house with all its carved parts painted!
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