Q3: What a company was the source of the pollution that caused Minamata
A3: Chisso Corp. (called Shin-Nippon Chisso Hiryo K.K. at that time) was
Around 1955, Chisso Corp. produced the majority of the acetaldehyde used
in Japan at its factory in Minamata.
Acetaldehyde was largely used as a raw material for manufacturing products
such as plastics in those days.
In the manufacturing process, methylmercury was formed and contaminated
wastewater, a large amount of which was discharged into the sea.
In addition, Niigata Minamata disease was caused by methylmercury discharged
from Kanose factory of Showa Denko K.K. into the Agano River.