Other spectrally balanced payloads are made up similarly as double base propellants and contain nitrocellulose (NC), and other esters of nitric acid or nitro compounds as oxidizers such as e.g. hexanitroethane and nitro compounds and nitramines as high energy fuels. The main advantage of the latter payloads is their low visibility due to the absence of metals such as sodium and potassium that may be either easily thermally excited and give prominent emissions or give condensed reaction products (such as carbonates and chlorides), which would cause a distinct smoke trail.