A Color Notation is a method developed by A. H. Munsell in order to produce a unified system of color classification. The system identifies three color dimensions hue (color name), value (lightness), and chroma (color purity) and was the first to base the outcome on a scientifically rigorous method of testing humans' color vision. The three dimensions are depicted on a color sphere with pure hue changing around the equator, value changing from light to dark from the north to the south pole, and chroma varying on the inside of the sphere towards the neutral grey of the north-south axis. The Munsell system is still widely used today, for example to define skin and hair colors for forensic pathology, for matching soil colors, or for the selection of shades for dental restorations. (Summary by Availle).