BLOOD: Life Uncut from Science Gallery London, is a four part series that aired on Resonance FM that explores questions about blood from a range of diverse voices. In the second episode “Who dunnit?” presenters Femi and Jessie follow a trail of 'acid yellow' dye to an artist in a laboratory; investigate rumours of a ground breaking forensic spray being developed at King's, and get a crash course in blood spatter analysis from the director of forensic services for the City of London Police. Visit https://london.sciencegallery.com/blood/london/ for details of the accompanying exhibition and event series in South London.