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Updated: May 7, 2025
Petrie, deoxidized the hæmatite burnishing, and so turned the red colour to black. "In good examples the hæmatite has not only been reduced to black magnetic oxide, but the black has the highest polish, as seen on fine Greek vases. This is probably due to the formation of carbonyl gas in the smothered fire.
=Sewer Gas.= Cesspool emanations usually consist of a mixture of sulphuretted hydrogen, sulphide of ammonium, and nitrogen; but sometimes it is only deoxidized air with an excess of carbonic acid gas. Symptoms.
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