> Hi Jon,
> I am wondering if, perhaps, there is a heat issues with
> limestone blocks? Heating, cooling might cause these blocks to
> crack, especially if they are travelling long distances where
> they are exposed to many days of strong sunshine. Perhaps the
> whitewash was to help keep the blocks 'cool' during
> transportation, the white surface reflecting away much of the
> solar radiation. Just a thought.
I don't think white limestone gets very hot in the sun, but it's very porous. So perhaps there was a reason to seal the surface of the stone. Although the entire stone doesn't seem to be coated with plaster, only part of it does. And recall that the lower RCs were primarily granite (floor, ceiling, and walls), and in the middle chambers the walls become limestone, and by the time we get to Campbell's, all but the floor is limestone.