*Anecdotal data on this matter comes from a former nurses’ aide named Juli Pankow, who e-mailed me regarding her observation of what she took to be the soul of a dying nursing home patient. The room was dark. She had just heard the woman’s death rattle. “There was a greenish-purple very very faint cloud or haze right above the chest.” From a Google search, I learned that exploded barium can appear as a greenish-purple cloud, though the cloud in question was linked to a NASA project, not post-barium-enema gas, so who knows.