Bright red color on postmoem staining found in -
The colour of postmoem hypostasis in HCN poisoning is bright red due to impaired oxygenation of tissues and formation of cyanmethhemoglobin. Dr.Narayana Reddys Synopsis of Forensic Medicine and Toxicology 27th edition pg. 78,315.
CO
HCN
H2S
P
Death and postmortem changes