METHOD FOR DETERMINING COLORIMETRIC VALUE

摘要

The colorimetric value at a specified temperature is determined by measuring thecolorimetric value of a colored material sample at an arbitrary temperature using a colormeter such as a spectrophotometer, colorimeter, or densitometer, and by correcting themeasured colorimetric value on the basis of the change in colorimetric value withtemperature, which change in colorimetric value is computed from the difference incolorimetric values observed on a single colored material sample under at a minimum of twodifferent temperatures. When a spectrophotometer is applied, the spectral reflectance or thespectral transmittance of the colored material sample is measured. On the other hand,spectral reflectance or spectral transmittance is measured in advance for a dye or pigment at aminimum of two different temperatures. The difference (.DELTA.K) of absorption coefficient (K),the difference (.DELTA.S) in the scattering coefficient (S), and the difference (.DELTA.D) in absorbance(D) at each wavelength are computed from the preliminarily observed spectral reflectance orspectral transmittance. The spectral transmittance or spectral reflectance observed at anarbitrary temperature is corrected to define the colorimetric value at a specified temperatureusing the obtained values of K, S, and D. The method allows the determination of thecolorimetric value of a single or a mixed color at a high level of precision using a simpleoperation under arbitrary temperature conditions without generating observation differencescaused by temperature change.