Tannerite is a brand of binary explosive targets used for firearms practice and sold in kit form. The targets comprise a combination of oxidizers and a fuel, primarily aluminium powder, that is supplied as two separate components that are mixed by the user. The combination is relatively stable when subjected to forces less severe than a high-velocity bullet impact. A hammer blow, the product being dropped, or impact from a low-velocity bullet or shotgun blast will not initiate a reaction. It is also designed to be non-flammable (the reaction cannot be triggered by a burning fuse or electricity), although its explosion can ignite flammable material. Because it is sold as separate components which are not themselves explosive, it is not regulated by the U.S. Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), and can be transported and sold in many places without the legal restrictions that apply to explosives. The term tannerite is often used to refer to the mixture itself, and other reactive targets and combination explosives are often generically referred to as tannerite. Uses Tannerite brand targets explode when shot by a high-velocity bullet. Low-velocity bullets and shotgun ammunition will not initiate a reaction. The explosive reaction, once initiated, occurs at a very high velocity, producing a large vapor cloud and a loud report. It is marketed as a target designation that is useful for long-range target practice: the shooter does not need to walk down-range to see if the target has been hit, as the target will react and serve as a highly visible indicator. Binary explosives like Tannerite are also used in some business applications, including commercial blasting, product testing, and special effects. Tannerite offers a "boom box" kit which includes colored powder for gender reveal parties. For safety reasons, Tannerite Sports recommends using no more than of the mixed composition at once, and will sell its largest targets with a size of to professionals only. Target composition and sale Tannerite targets are sold in pre-sized quantities. The package includes two containers. An oxidizer composition is contained within one of the containers and a catalyst composition is contained within the other. The product, developed by Daniel Jeremy Tanner, and initially formulated in 1996, consists of two components: a fuel mixed with a catalyst or sensitizer, and a bulk material or oxidizer. The fuel/catalyst mixture is 90% 600-mesh dark flake aluminium powder, combined with the catalyst that