An aerosol spray is a colloid of minute liquescent droplets or solid particles in a gas. Colloquially, aerosol usually refers to an aerosol spray that delivers a consumer product from a can or similar container. Although the concept of aerosol probably goes back as far back as 1790, the first patent for an aerosol spray can was granted in Oslo in 1926 to Erik Rotheim, a Norwegian chemical engineer and a United States patent was granted for the innovation in 1931. The Safety Supply Company has assembled a range of useful aerosol products that are essential to safety and industry alike.