Doubt With Azerbaijani Stamp

I've managed to acquire a copy of the 1925 Azerbaijan issue, specifically SC#25. I saw on Stampforgery that the original is bicolor, with a gray-violet and black color, while the forgery is entirely brownish-gray. However, when I looked at Solovyov's catalog, volume III, the photograph shows it not as bicolor but as completely brownish-gray, like the Stampforgery forgery…

It appears you expect a book printing to very accurately reproduce two very similar philatelic colours.

It's not that, but it should be bluish, not brown, or at least bicoloured...

Greyish lilac can be very dark and show as a dark grey or black shade. Black secondary printing, then, can show up as very similar.

The first image is from Stampforgery, the second is from the BigBlue website... BigBlue and the Soloviov catalog show the color of the Stampforgery counterfeit, and Scott says it's two-tone, which is closer to the original Stampforgery version...

I would not be surprised if stampforgery got the two mixed up. That left one has nothing to do with lilac or any tone of lilac, certainly not greyish lilac. Or violet that Scott appears to use (the Russian is t(?)-lilac).

The left image appears to be closer to blue (siniy), which is the word used for the 400 R.

Maybe this will help, or just confuse you further. From Linn's Stamp News, 1993. Keep in mind this is for the150 ruble value, not the 500 so the information may not be relevant.

This is my copy...sorry for the bad photo…

The stamp identified as forgery by the earlier post appears a closer match to the genuine one in the Linn's article, although the one identified as genuine does not completely match the forgery in the Linn's article. The shading on the apron, also, appears to dismiss the classifications of the stampforgery website.

@murasama, I see your point. Without being able to tell whether it is genuine, I would ignore the stampforgery images you posted earlier as a reference.