Cornstarch does kill ants. Ants are attracted to the cornstarch and try to eat it. Because they are unable to digest this, they starve and slowly die.
Cornstarch should be placed in the path of the ants so they may carry it back to their nest. Cornstarch can be considered as an alternative and safer method of removing ants instead of using traditional shop-brought products which can be harmful to animals and children. It should be noted, this method is unlikely to work as quickly as using shop-brought products that contain chemicals. Alternative methods for removing ants that don't require the use of shop-brought chemicals can be used while using cornstarch.