Actives: Silicon Dioxide 80% (Present as 100% Diatomaceous Earth) TERRO Ant Killing Powder provides effective and long-lasting insect control. It can be used indoors or outdoors where insects are found, or may hide. This unique, patented formula contains amorphous diatomaceous earth and an attractant. TERRO Ant Killing Powder is odorless and non-staining. This dust solution is long-lasting, remaining effective as long as product is present.