Has Damien Hirst's art been leaking formaldehyde gas?
Scientists have discovered that an exhibition by the artist Damien Hirst - including dead animals preserved in giant tanks - released potentially dangerous formaldehyde fumes at the Tate Modern in London.
A report in the journal, Analytical Methods, said levels of the gas at the 2012 exhibition were above those legally permitted - but the scientists and the museum say the public were not at risk.
"Tate always puts the safety of its staff and visitors first, and we take all necessary precautions when installing and displaying our exhibitions," a Tate Modern spokesman said.
"These works contained a very dilute formaldehyde solution that was contained within sealed tanks."
Arts editor Will Gompertz explained the issue on the Today programme.