A wet treatment method useful in at least one of a chemical processing step and a rinsing step performed upon fabrication of semiconductor devices is disclosed. The content of the aminosugar is an effective amount to stabilize the vitamin B1, and is, for example, not less than 0. The device has a combination of layers including at least one supporting plate and a coating layer which is applied thereto. A charger having the magnetic core and the secondary winding is operable to supply a charging voltage to a rechargeable battery in the touch pen based on an input voltage across the primary winding. The communication system is connected to the electronic device for printing and the ink reservoir or the reservoir system.