The Smithsonian's National Portrait Gallery has begun planning the conservation and digital analysis of the full-length "Lansdowne" portrait of the first US president that was painted by Gilbert Stuart in 1796, museum officials told The Associated Press.
The picture is considered the definitive portrait of Washington as president after earlier images in military uniform.
Work will begin in 2016 to delicately remove a yellowed varnish to reveal the original colors and details intended by the artist. The painting will remain on view until then.
"We are preserving this painting forever, for posterity, and at this point in its history, it needs some attention," said chief curator Brandon Brame Fortune. "It's still very, very stable. But we want to be sure our visitors are seeing it looking its absolute best."
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Bank of America provided a recent grant to fund the conservation project, along with education programs around the picture.
Plans call for the improvements to be completed in time for the museum's 50th anniversary in 2018.
The Lansdowne portrait has been a centerpiece at the Smithsonian since 1968, and about 1 million visitors see it each year.
For his first full-length portrait, Washington was dressed in a black velvet suit, his official dress for receiving the public as a civilian leader, rather than showing him as a soldier or king.
The president sat for Stuart in Philadelphia and helped determine how he would be portrayed. The resulting picture was celebrated in the US and Europe. It was originally painted for the Marquis of Lansdowne, who had been a British supporter of the colonies during the Revolutionary War.
Stuart created three replicas of the portrait, one of which is held by the White House. It was made famous when Dolley Madison saved the painting when the British burned the White House 200 years ago.