A polarizer is provided comprising a subwavelength optical microstructure wherein the microstructure is partially covered with a light-transmissive inhibiting surface for polarizing light. It is provided a defined behavior of an older device, if it has to handle information of a higher version number than supported by itself. The determination of the weighting vector can include retrieving the vector from a weighting vector table. Users can change modes manually or can specify automatic mode selection based on time of date, day of week, location, andor other factors. Accordingly, there is provided an electron-emitting device which avoids a formation defect of the electron-emitting region due to the existence of the foreign matter and which has satisfactory characteristics without fluctuation. Said mixtures are used to produce oral hygiene and dental hygiene products in particulars, toothpastes.