Warren Mumpower and I were discussing his attempt to paint a tunnel entrance and some grain towers to look like concrete. He tried to do it with one color, and said that he was disappointed with how it turned out. He said that it was very green, and, indeed it is. Yet, he says that when the pain stick is laid on the concrete floor at Lowes, it almost disappears.
I gave it some thought over the night, and came to the realization that concrete is not just one color. Our brains process it as one color, but it is really made up of grays, blacks, greens, reds, probably every color of the rainbow.
I wonder what would happen if you took an air brush and lightly weathered in different colors until it looked right?
You can always paint over it.