We paint a number on each stone, then we carve the number on the stone.

BBC: Piecing together puzzles in Cambodia

She minimized paint (using plaster walls inside, stone outside and steel-clad windows) so as to avoid retouching work.

WSJ: In Napa, Kelly Fleming Blends House and Winery

They said the temple walls were made of stone and covered in fine yellow clay which also contained some traces of red paint.

BBC: El Paraiso site