Daniel Matthews, a Forensic Scientist, tells the jury that clothing and footwear belonging to Mick and Mairead Philpott and Paul Mosley was examined.
He said he was looking for signs of 'any microscopic burn damage to recent exposure to a mixture of fuel and air known as a flame wash.'
Mr Matthews said he was asked to look for remains of petrol cans or a funnel. He didn't find any but did find a severely damaged aerosol can.
Following Derbyshire Fire Service's recommendations over having sprinklers in homes, here are the best ways to improve fire safety at home.
Speaking exclusively to ITV News, Dawn Bestwick said jail wasn't good enough for MIck Philpott and that "as a coward" he "deserved to die".
The events that eventually led to parents Mick and Mairead Philpott and friend Paul Mosley's conviction of manslaughter.