Agent Blue is one of the “rainbow herbicides” that is known for its use by the United States during the Vietnam War. It was sprayed on rice paddies and other crops in an attempt to deprive the Viet Cong of valuable crops. Agent Blue is a mixture of two arsenic-containing compounds, sodium cacodylate and cacodylic acid. Agent Blue is chemically unrelated to the more infamous Agent Orange and other herbicides used during the war.
Approximately 1.25 million gallons (4.74 million liters) of Agent Blue were used in Vietnam during the war, destroying 500,000 acres (2,000 km2) of crops.
Today, large quantities of the chemical named Agent Blue are still used on lawns and crops throughout the USA