Why Taj Mahal is becoming yellow nowadays
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Environmental scientist Mike Bergin of the Georgia Institute of Technology in Atlanta has a theory:
"Scientists didn't know what exact process caused the discoloration: Perhaps it was fog droplets oxidizing the surface or maybe sulfurous gas in the air. But Bergin had an idea: Because the brown material could be removed only by clay and not by water, the source of pollution must be small, water-insoluble particles in the air. So he and colleagues measured small particles in the air and stuck sample marble squares on the building to collect the pollutants. Just as he thought, the sample marble squares were covered with dust and light-absorbing carbon particles floating in the air. Computer modeling showed that these particles absorb ultraviolet light, thus giving the dome a yellow-brown shade."
"Scientists didn't know what exact process caused the discoloration: Perhaps it was fog droplets oxidizing the surface or maybe sulfurous gas in the air. But Bergin had an idea: Because the brown material could be removed only by clay and not by water, the source of pollution must be small, water-insoluble particles in the air. So he and colleagues measured small particles in the air and stuck sample marble squares on the building to collect the pollutants. Just as he thought, the sample marble squares were covered with dust and light-absorbing carbon particles floating in the air. Computer modeling showed that these particles absorb ultraviolet light, thus giving the dome a yellow-brown shade."
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