Carbon monoxide poisoning shows the following post-moem staining:
In carbon monoxide poisoning, the colour of post moem staining is cherry-red. In poisoning by nitrites, potassium chlorate, potassium bicarbonate, nitrobenzene, acetanilide, bromates, and aniline the colour is chocolate brown. In asphyxia, the colour of the stains is deeply bluish-violet or purple. A bright pink colour is seen in hypothermia and bodies taken from cold water. Ref: The Essentials of Forensic Medicine and Toxicology by KS Narayan Reddy, 27th edition, Page 139.
Cherry red postmoem staining
Pink postmoem staining
Chocolate coloured postmoem staining
Blue postmoem staining