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Postmortem Drawing or Facial Reconstruction from a Skull
Forensic artists may be called upon to assist with a postmortem drawing or facial reconstruction from a skull. This is done when human remains are recovered but investigators have been unable to identify the body. The forensic artist's image can assist investigators in searching missing persons databases. The identification can them be positively made by DNA or dental comparisons.
Based on the condition of the remains, the forensic artist must first decide whether to do a postmortem drawing from the morgue photos, or a two or three-dimensional reconstruction of the face from the skull. The postmortem drawing would be done if there was enough of the soft tissue still left on the skull. In most cases where the body is badly decomposed, a facial reconstruction from the actual skull would have to be done.
Illustrations below by Karen T. Taylor.
This is the technical phase of the reconstruction. Vinyl eraser strips are cut to the exact length (in millimeters) according to the tissue depth date chart appropriate for the individual. The tissue depth data chart is compiled from a study on the tissue depth of cadavers done by Rhine and Campbell in 1980. The study took into consideration the thickness of muscle, fatty tissue and connective tissue, as well as skin thickness at a particular morphological landmark on the skull. The tables are prepared for Native Americans and persons of Asian descent, African-Americans or persons of African-derived heritage, and American Caucasoid, or persons of European descent. The tables are further divided by slender, normal or obese groupings, as well as by the sex of the individual.
The tissue depth markers are then glued to the skull at the appropriate anthropological landmarks using a cement glue, which is later removed with acetone. The skull is then photographed, taking care that it is set in the Frankfort Horizontal position (attained by placing the bottom of the eye-orbit horizontal to the top of the external auditory meatus, or bony ear hole) so that there is no perspective distortion. The photograph is then printed in one-to-one prints or life size enlargements.