IIRC there was a protective limestone layer with a gold cap (removed for use in other buildings by later civilizations) on top of the pyramids versus leaving th

IIRC there was a protective limestone layer with a gold cap (removed for use in other buildings by later civilizations) on top of the pyramids versus leaving them as is, they originally did not look like unfinished stone. There is constant wind erosion on the exposed stone layer now. I don't know what a good solution to this now.