Caput mortuum: spectroscopic and structural studies of an ancient pigment de Oliveira, Luiz F. C. ; Edwards, Howell G. M. ; Frost, Ray L. ; Kloprogge, J. Theo ; Middleton, Paul S. Abstract Publication: The Analyst Pub Date: April 2002 DOI: 10.1039/b111473p Bibcode: 2002Ana...127..536D