“…Although there is no indication currently that the face layers are fragmenting on these foils, their longer-term integrity is thought to be questionable. Given the age of the foils and the radiotoxicity of radium, Whitcher et al (2022) recommend that discoloured foils should be taken out of service and disposed. This paper reached our short-list because of the meticulous way in which the various types of observations were used in combination and because of the clear way in which the story of the investigations was told.…”