Our home was built in the mid 60's. The exterior is "brick," or what looks like brick. It actually has what appears to be sand and small stones in it, much like a concrete block. It is both longer and wider than a "standard" brick, and one wall of the attached garage is actually made of nothing but this material...it has no framing of any kind. The center core of the bricks look like a concrete block; they have large square holes instead of the small circular holes often seen in clay bricks. It is colored red, but has faded quite a bit over time..you can tell the difference under the windows where the sun doesn't hit it. Also when it rains, the rain penetrates the surface of this material to the point where it will remain visibly wet for a day or two (it actually comes through the attached garage wall mentioned above if it rains hard enough). My question is, is this actually colored concrete or what? I didn't think that technology existed back in the 60's, but maybe I'm wrong. I would be more than happy to post pictures of it all if needed. Thanks in advance!!