There is a device today, called the Drummond Microdispenser, which uses rational residual solvents, and its solvent is Triacetin. This device is delicate, accurately controlled, and quite effective in solvent operation. It can make the amount of Triacetin not less than a millimeter, and it is suitable for everything. Those who operate this device should be clear about their methods and cautious, so as to ensure that everything goes smoothly and not make mistakes. In this way, it can be said that it is good to deal with residual solvents such as Triacetin.