A variety of pollutants and other contaminants may be removed from a variety of aqueous media using electrolytic treatments. It is desired to have a base finish formed on the panel and a first color pattern and the black color pattern formed by spattering of paint on the panel, screen printing, or attaching a lamina having the first color pattern and the black color pattern thereon. A price database contains price information based on produce type and grade. The pull-up circuit includes a dual-gate transistor.