The only mention of color is when the ship was when it ran trials in Odessa nicknamed “blue cruiser”. There are about 16 photos and the best I can tell is the ship had a uniform color that was is a mid to slightly darker range. Some photos are over exposed. It is a good article and provided more information than I had before. The endnotes are a who’s who of designers and engineers who ran a fowl of Stalin. 1935-1939 was not a good time to design Soviet ships.