Green blue postmoem discoloration is seen in which poisoning -
The colour of postmoem hypostasis in hydrogen sulphide poisoning is bluish green. It is an asphyxiant which inhibits cytochrome oxidase. Dr.Narayana Reddys Synopsis of Forensic Medicine and Toxicology 27th edition pg. 76,313.
Cyanide
Carbon monoxide
Phosphorous
Hydrogen sulphide
Death and postmortem changes