Mercury oxide, chemically HgO, is a highly poisonous inorganic chemical substance. In its natural state it is an odourless powder which may appear from yellow, through orange, to red in colour. It is both dangerous to the environment and to many organisms (particularly aquatic). Synonyms include mercury (II) oxide, mercury monoxide, mercuric oxide, mercuric monoxide, and any of these followed by the colour of the powder.
It is sensitive to light and is incompatable with many oxidising and reducing agents
Physiological danger
Though it is not immediately flammable, it may violently react upon friction or heat. The substance is dangerous upon inhilation due to it decomposing at 773 kelvin. Toxic fumes released include carbon monoxide, carbon dioxide and mercury. It is taken up quickly by respiratory, gastrointestinal and skin surfaces. Upon contact mercury poisoning is experienced—the mercury circulates the blood system being gradually taken up by organs such as the spleen, liver, kidney, brain and bones. Primarily effects are those on the nervous system and the mouth. Cardinal symptoms include tremors, stomatitis and psychic disturbance (loss of memory, insomnia, confidence loss, irritation, vague fears and depression).
Upon inhilation and ingestion excessive salivation, pain when chewing, gingivitis and a dark line on gums may occur. Skin turns red, itches and inflames; and eyes turn red, burn, water and itch.
