Remember the color of German tanks during the beginning of the Second World War.
I have read about studies conducted in the early 20th century by the Russian military department in choosing camouflage colors for Russian field uniforms. The most noticeable colors were recognized as white, yellow, black, blue, red, dark green, bright green, brown and blue, and the least noticeable were yellow-brown, gray, blue-gray, olive, yellow-green-gray and grey-blue.