An ellipsoid chroma region of a chroma plane may be defined to specify a range of chromas for which a secondary chroma modification is to be applied, and to determine an output chroma for each chroma of the chroma plane based on the ellipsoid chroma region. For achieving the above purposes, the antibacterialantifungal agent according to the present invention includes; zinc oxide as a main component; and alkali metallic salt one or more selected from the group consisting of lithium, sodium, and potassium hydroxides, hydrogencarbonates, and carbonates. The bottom water pan dries up water faster than the other water pans since it has the hottest coil soldered underneath. The scintillator includes a non-columnar crystal and a plurality of columnar crystals erected by crystal growth. In particular, the present invention relates to a device and method for retaining and stabilizing a dental dam or Class III matrix, or other device, in the mouth of the patient, which can be clamped between 2 adjacent teeth. The invention also concerns a group of novel isoflavan and isoflav-3-ene compounds.