The painting "Beautiful Woman" by Chun Kyung-Ja has been the focus of a bizarre, decades-long dispute over its authenticity, and Monday's announcement by the prosecutors looks unlikely to end the matter, with Chun's family vowing to pursue efforts to have it declared a forgery.
Born in 1924 in a small town in the southern part of the Korean peninsula, Chun Kyung-Ja was best known for her paintings of female figures and flowers using vivid primary colours that broke with traditional South Korean styles.
Before her death last year at the age of 91, Chun had repeatedly insisted that "Beautiful Woman" -- a 1971 portrait owned by the South's National Museum of Modern and Contemporary Art (MMCA) -- was not one of hers.
"Parents can recognise their children. That is not my painting," she insisted.
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The museum was equally adamant that it was, and in April a prosecutorial probe was launched after one of Chun's daughters filed a complaint, accusing former and current MMCA officials of hurting the artist's reputation by promoting the painting as authentic.
They also clarified the provenance of the painting, saying it was once owned by the former head of the South Korean spy agency and was appropriated by the government after he was executed for assassinating then-president Park Chung-Hee in 1979.
"We tried to uncover the truth by using all possible technologies available for authentic assessment of arts," a member of the prosecutors' team said.
Chun's family today rejected the conclusion and accused the prosecutors of seeking to help the state museum authorities save face.
The statement referred to the French imagery analysis firm Lumiere Technology that had earlier estimated the possibility of the painting being authentic at less than 0.0002 per cent.