Basic aspects and applications of tristimulus colorimetry

A detailed account of the specification of colour using the 1931 Commission International de L'Eclairage tristimulus coordinates and subsequent colour spaces for the measurement of small differences in colour is provided along with a review of the application of quantitative parameters for the evaluation of colour changes of acid-base and complexometric indicators. The development of screened indicators to improve the quality of colour changes at the equivalence point is discussed. Various computer programs proposed to calculate the different parameters by different algorithms are reviewed.