1963_Kikuchi - Estimation of the Age of the Writing in Blue Black Ink (III)
The author studied on the color of stains of iron-gallotannate ink. Ink stains of 5 em in diameter were made on a sheet of paper under various conditions and their spectral reflectance curve was analysed by CIE standard collimetric reference system. Munsell renotation system was also used for the colorimetric specification. Chromatic coefficient (x, y), specific reflectance (Y), dominant wave length (~o), excitation purity (Pe), hue (H), value (V), chroma (C) and color difference (.dE) of these stains were calculated and the results of different materials were compared.