Hydrogen sulfide thus produced can cause effects on central nervous system, including convulsions, changes in blood pressure and respiration, respiratory arrest, and possibly death. Chronic inhalation may cause bronchopulmonary disease which may be complicated by emphysema and bronchiectasis. Repeated and prolonged contact with iron oxide fume can cause staining of the eyes and changes in chest x-rays indicative of lung damage. Repeated and prolonged contact with manganese oxide fume can cause effects on the central nervous system. Symptoms include fatigue, weakness, and loss of appetite.
Further exposure can lead to changes in speech, gait, muscle cramps, twitching and tremors.
Symptoms of permanent manganese oxide toxicity are identical to those associated with Parkinson's desease. There is also some evidence that chronic manganese oxide exposure causes decreased fertility in males. None of note. Iron and manganese are essential elements for humans. Immediately flush eyes with large amounts of water for at least 15 minutes.