The famed monument to love ... has for years been acquiring a yellow tinge despite a ban on coal-powered industries in the area.
Authorities have been applying "mud packs" around the side walls and towers since last year to draw the impurities out of the stone, but have not yet touched the main central dome. [...]
The mud-pack therapy involves covering the surface with fuller's earth and leaving it to dry before removing it with soft brushes and distilled water.
— yahoo.com
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