standing sentry along the National Mall monuments figures of American history monuments impose. But generations after that his legacy is cemented tarnish his image somewhat.
A black mass is spread like a disease in the Marble Washington DC Abraham Lincoln was the great liberator, but so far the National Park Service was unable to solve the memory of the 16th President of the sludge.
"Between the Tennessee and Ohio, right on the edge ... you can see the real dark place, and begins a little slide down", Mike Litterst Service Park CBS News Marcos Albert said.
The substance is biofilm, composed of thousands of different bacteria, molds, and other species which corresponds to the surface of the stone.
"He called mud, but when you touch it, it is dry, do not fall on your fingers," said Albert.
"Right, and again, mud, secretions, sprinkles -. Microscopic all nothing we with the naked eye or even be able to clean will see the touch", Litterst said.
This makes it difficult to clean it. Litterst said experts do not know where the wine biofilm or how to get rid of him.
It is also in Arlington National Cemetery and Washington Monument. But by far the worst in the Jefferson Memorial , where the white dome is now covered with black spots.
"We have not let the intention of nature fulfill their course and a magnificent white marble rotunda with a blackened biofilm" Litterst said.
Therefore, the parking fee in the offensive, experiments goes in laboratories on the right side of the monument. The valet went this month with the mystery of sludge public after people continue to confuse black with dirt and complained that the agency did not take own monuments.
see the black glass was a shock to the Stiles New Hampshire family.
"We were a little by postponing it because they expect them to be clean glass", Kristin Stiles said. "And we loved sightseeing, we thought it was great, but we realized that many of them."
The Park Service now shows signs to let people know about the battle and has at least 100 public cleaning get advice - including Jane Weber, Florida, suggesting water.
"You must go," Weber said. "It is a bit ugly. We have to clean up. "
Judy Jacob, a restorer at the service park in New York, helped a global team of scientists, microbiologists and architects build, trying to create the mud an antidote.
"This is a big challenge," Jacob said, ".. We do not even know if the biofilm - Apart from an aesthetic problem - The source of marble or damage, if it is really to protect the marble"
"It's very frustrating. And it's one of those things, the more you look at it, the more questions we ask, the more we will come up with all sorts of theories and ideas, but so far there is no permanent solution to get rid of biofilms known "Litterst said.
And it is always faster every year. Thomas Jefferson helped the red tailcoats, but so far no luck now to stop the black coat to penetrate the nation's capital.
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