| 摘要 |
The present invention provides a phenothiazine-derivative color-measuring method that can detect a phenothiazine-derivative color even at a wavelength longer than the wavelength that exhibits maximum absorption. A phenothiazine-derivative color is detected, by adding a 5-hydroxy-1-(4-sulfophenyl)-4-(4-sulfophenylazo)pyrazole-3-carboxylic acid salt, 6-hydroxy-5-(4-sulfophenylazo)-2-naphthalenesulfonic acid salt, 3-hydroxy-4-(4-sulfonaphthylazo)-2,7-naphthalenedisulfonic acid salt, or 7-hydroxy-8-(4-sulfonaphthylazo)-1,3-naphthalenedisulfonic acid salt to the reaction system containing a phenothiazine-derivative color, and then measuring the light absorbance at a wavelength of 610 to 730 nm. |
