The quenched hardness of a metal depends on its chemical composition and quenching method. Common heat treatment processes include annealing, precipitation hardening, quenching, and tempering. Common heat treatment processes include annealing, precipitation strengthening, quenching, and tempering. Heat treatment processes such as quenching and tempering can significantly change these properties, however. Optical sensing works by detecting ions and molecules of interest via fluorescence quenching mechanism. The most common are annealing, quenching, and tempering. The cylinder is heat-treated by quenching and tempering to provide the best strength and toughness. The proximity of eosin molecules leads to the quenching of its fluorescence. As one of the last processes in fabricating a sword is quenching and tempering it. Typical heat treatment involves solution treatment and quenching. Al alloy is prepared by dissolving nickel in molten aluminium followed by cooling ("quenching"). When the plasma touches the vessel walls it undergoes rapid cooling, or "thermal quenching". Possibly followed by quenching in water and drying. This can lead to quenching effects due to clustering of dopant ions. The isolated particles were in-situ created through rapid plasma quenching with Helium pulses.