article_snippet: the artist's paintings are some of the most valuable in the world - yet many of the artist's paintings are slowly fading away.
article_snippet: Museums could also help to slow the fading by changing the environment in which the paintings are being kept.
article_snippet: However, The findings suggest that many of Van Gogh's most valuable paintings may be under threat.
article_snippet: Van Gogh's paintings are widely considered among the most valuable in the world.
article_snippet: One,  known simply as Irises, is listed among the most expensive paintings ever sold and is thought to be now worth more than £70.6 million.
article_snippet: Van Gogh struggled to sell Van Gogh's paintings during Van Gogh life and wrestled with mental illness that led to Van Gogh cutting off Van Gogh own ear and later shot Van Gogh at the age of 37.
article_snippet: It was only after Van Gogh death that the importance of Van Gogh work began to be truly recognised and Van Gogh works are now among the most expensive paintings ever sold.
article_snippet: In 1993 Van Gogh painting A Wheatfield with Cypresses sold for £36 million.
highlights_snippet: Scientists warn that many of the artist's paintings may be at risk of this process .
  