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Related to colorimetry: spectrophotometry, Beer's law


Any technique by which an unknown color is evaluated in terms of standard colors; the technique may be visual, photoelectric, or indirect by means of spectrophotometry; used in chemistry and physics.



(1) In analytical chemistry, colorimetry is a group of photometric methods of quantitative analysis based on the determination of the concentration of substances in a colored solution by measuring the amount of light absorbed by the solution. The amount of light absorbed, the thickness of the layer of solution, and the concentration of the solution are related by a formula that obeys the Bouguer-Lambert-Beer law:

(1) I = Io · e-kcl

where I is the intensity of light after passing through the absorbing medium, Io is the intensity of the incident light, l is the thickness of the layer of solution (in cm), c is the concentration of the absorbing substance (in moles per liter), and K is a constant for light of a particular wavelength. After the logarithm is taken, equation (1) takes the form

(2) In (Io/I) = Kcl = D

where D is the optical density of the solution. It follows from equation (2) that D is directly proportional to the concentration of the substance in the solution.

A distinction is made between subjective (visual) and objective (photocolorimetric) methods of colorimetry. In visual methods, the optical density is determined by comparing the color of the solution being studied with the colors of a series of standard solutions, as well as by using visual colorimeters. In objective methods, photoelectric colorimeters are used.

(2) In physics, colorimetry is the methodology of measuring and expressing color in quantitative terms, and also the set of such methods.


The science of measuring color. The International Commission on Illumination (Commission Internationale de l'Eclairage) governs this subject along with all aspects of lighting and illumination. See CIE Lab and colorimeter.
References in periodicals archive ?
After each treatment, the roughness, wettability and colorimetry of the samples were evaluated.
The present work has as its main objective, the characterization and model colorimetry of Malathion at different solutions, developed experimentally, in a preliminary study of color spectroscopy.
The N content was estimated by Kjeldahl method and the P and K content were determined by Mo-Sb Colorimetry and Flame photometry method respectively [19].
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To further characterize the structural color it produced, the colorimetry principle is introduced.
Thin-film thickness and color by colorimetry of sub-micrometer areas may be determined.
Given that it is easy to see when the material stops flowing and turns into a gel, the new approach of nitric oxide detection is simpler and less subject to interpretation than other detection methods, such as colorimetry and spectroscopy.
Both moldings were exposed to ultraviolet radiation using a Xenon arc chamber and then examined for signs of degradation using colorimetry, infrared spectroscopy, and a novel nanoindentation technique.
This edition includes translations of the first resolutions on colorimetry and a paper on Wright's work on the 1931 system as well as articles on basic CIE colorimetry, color difference metrics, spectral color measurement, tristimulus color measurement of self-luminous sources, color management, and color rendering of light sources.