A method and system for applying makeup to provide a natural appearance. In an embodiment, the system selects the dispensed item based on both user-specific and item-specific information. A method of preparing a radiolabeled complex includes flowing a radiometal solution comprising a metallic radionuclide through a downstream mixing portion of a microchannel, where the downstream mixing portion includes one or more passive mixing elements, and flowing a ligand solution comprising a bifunctional chelator through the downstream mixing portion. in food industry, therapy and hus-handry. The transistors drive the data bus terminals to either a first or a second voltage if the first mode of operation is selected and to either a third or a fourth voltage if the second mode of operation is selected.