Oxide of chromium is a suspected carcinogen. Can cause skin and respiratory irritation and allergies. Causes cancer in animals and possibly in humans. Manganese blue contains soluble barium and can cause skin, eye, nose, and throat irritation. Inhalation or ingestion can cause barium poisoning with symptoms of heart irregularities, intestinal spasms, and severe muscle pains.
Chronic poisoning is most likely.
Manganese dioxide can cause a serious nervous system disease resembling Parkinson's disease. Early symptoms include apathy, loss of appetite, weakness, spasms, headaches, and irritability. Inhalation or ingestion can cause nervous system damage. May produce allergic reaction by skin contact or inhalation resulting in nodules under the skin or in the lungs. May cause ulcers of the nose and skin.