LOT OF 2 BOXES Borax is the common name for sodium tetraborate: a naturally occurring substance produced by the repeated evaporation of seasonal lakes. 20 Mule Team Borax is 100% natural, and 99.5% pure (there is about a half of 1% of naturally occurring trace minerals). Once removed from the ground it is washed, dried, and boxed for consumers. Borates, borax and boron compounds are with us throughout our lives. Families use it to soak and wash diapers and other laundry, but it's also an ingredient in cosmetics, medicines, ceramics and building materials. The biggest industrial user of borates is the glass industry (especially fiberglass and gorilla glass). It's an important ingredient in agricultural chemicals and fire retardants. Absolutely nothing is added. No phosphates, per-oxside, chlorine, or other additive chemicals. Keep 20 Mule Team Borax out of reach of children. We also recommend labeling any containers containing 20 Mule Team Borax solutions to identify the contents.