Continuous ink jet is one of the oldest ink jet technologies in use and is fairly mature. One of its advantages is a very high velocity of the ink droplets, which allows the ink drops to be thrown a long distance to the target. Another advantage is freedom from nozzle clogging (because the jet is always in use). Volatile solvents (ketones and alcohols) can therefore be used, giving the ability of the ink to "bite" into the substrate and dry quickly.