Vladimir Umanets declined to reveal where he lives. But he said he knew he would probably be arrested:
Umanets is one of the founders of "Yellowism". He describes as "neither art, nor anti-art":
A man has admitted writing on a Mark Rothko work at the Tate Modern in London, but insists he is not a vandal. The writing on the bottom-right corner of the piece appears to read: "Vladimir Umanets, A Potential Piece of Yellowism."
Today, Mr Umanets, who is originally from Russia, claimed he had written on the painting, saying:
Police are hunting for a vandal defaced a painting by Mark Rothko at the Tate Modern art gallery.
Eyewitness Tim Wright said: "This guy calmly walked up, took out a marker pen and tagged it. Surreal."
A picture he uploaded to the social networking website showed five or six words scrawled on the bottom-right corner of the piece, with black streaks of paint running down from the daubed writing.
They appear to read: "Vladimir Umanets, A Potential Piece of Yellowism."
Police are hunting for a vandal who walked into the Tate Modern art gallery and defaced a valuable painting by Mark Rothko.
The visitor daubed black paint on the mural piece during a visit to the popular landmark yesterday afternoon, a spokeswoman for the gallery said.
The art gallery said it does not have a price for the defaced piece, but paintings by the Russian-born artist often fetch tens of millions of pounds.
Earlier this year, Rothko's Orange, red, yellow was sold for £53.8 million - the highest price ever paid for a piece of post-war art at auction in New York.
Scotland Yard confirmed it had launched an investigation into the matter and is yet to make any arrests.
The force said it was looking for a white male in his late 20s.
A painting by Mark Rothko has been defaced at the Tate Modern art gallery.
Police were called after a small area of the mural piece was painted, a spokeswoman for the gallery said.
The gallery was shut for a short period and then reopened.