Their skin was coloured cherry-pink from carboxyhaemoglobin, the stable compound formed in the blood by reaction with the gas.
2.
He learnt to read at the age of three, and at four, after injuring his forehead he asked the doctor, " Is this oxyhaemoglobin or carboxyhaemoglobin ? ".
3.
The exhaust gases causing death by asphyxia were tested by a chemist from T-4 to make sure they contained large enough amounts of carbon monoxide ( or 1 % concentration ), to form carboxyhaemoglobin, a deadly blood agent, in combining with haemoglobin in the cells.