Poisoning by oral intake of copper compounds: intense nausea, vomiting, blue or green vomit, blue staining of oral mucosa, burning sensation in the mouth and upper abdomen, severe abdominal pain and diarrhea, sometimes vomiting blood and black stools generally appear after 5 to 10 minutes of ingestion. Repeated vomiting and diarrhea can lead to shock, and after 2-3 days, back pain, jaundice, anemia, hepatomegaly and dark brown or soy sauce colored urine can occur due to hemolysis. Some severe patients develop oliguria, anuria, and acute renal failure. Skin contact with copper dust or copper compounds can cause contact dermatitis and eczema. Inhalation of large amounts of copper oxide fume and dust often results in chills, fever, excessive sweating, thirst, weakness and muscle aches several hours after work. Conjunctivitis, eyelid edema, corneal clouding and ulcers can occur when copper salts or copper dust is splashed into the eyes. Laboratory tests: elevated serum copper and urine copper.