1954 年 74 巻 12 号 p. 1322-1326
Using spots developed on a filter paper from 24 kinds of tar dyes for foodstuff, reflect-ance spectra in the visible range were measured with Beckman Spectrophotometer Model B, with a diffuse reflectance attachment. The majority of the spectra thereby obtained were found to agree well with absorption spectra of these dye solutions. A mixture of several kinds was submitted to paper chromatography and separated into componental parts. In order to determine the composition of such dye mixtures the separated colored spots were submitted to reflectance measurement. By comparing these measured values with the reflectance of the authentic dyes, satisfactory agreement was obtained.