Restoring the Ruin

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Mating two pieces
When it's time to fit a newly fashioned piece of marble with a broken or irregularly shaped ancient one, the team once again borrows from Periclean times. To ensure that the new piece exactly snuggles against the old, they coat the inner surface of the new marble with red clay. They gently push the two pieces together, then pull them apart. Points on the new piece that turn white—that is, where the clay is scraped off—indicate spots on the new slab that need fine-tuning. The operation is repeated dozens of times until the new marble precisely matches the ancient surface.

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