LA Mancha Negra is a black substance known as a Black stain. It first appeared in Caracas, Venezuela in 1986. Since the appearance of La Mancha Negra, it has caused multiple car accidents that have claimed lives. Researches have been made to find the cause. The cause has proven difficult to find and there are still no definitive explanations.
LA Mancha Negra can be described as an inch thick, black, thick, greasy blob. According to the Venezuelan Ministry of transport and communication believed, La Mancha Negra compose of dust, synthetic material and oil.
After a study, some findings showed that La Mancha Negra expands when the weather is hot and when cold its contracts.