As you know, the nromal wartime paint was this more black as grey colour as visible on the Borodinos (matter of weathering effect aside now). Out of this colour the Russian Grey later was developed by lighning it slightly up.
But I have also a source for your words in matter of looking on German Navy Grey of Imperial Navy before WW-1 here ... and that Russian Navy took over this.
As you wrote, the b/w photos are hard to rate even with special programs to make qualitiy better etc.


