Question

When can colourimetry be used to determine the rate of reaction?

Answer 1

In physical and analytical chemistry, colorimetry or colourimetry is a technique "used to determine the ... Only after the device has been calibrated can you use it to find the densities and/or concentrations ... A similar colorimetric assay, the Bicinchoninic acid assay, uses a chemical reaction to determine protein concentration.

Answer 2

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Colorimetry is the science of the measurement of colour. It involves the replacement of subjective responses, such as ‘light blue’, ‘rich dark purple’, ‘bright gold’, with an objective numerical system.
This study began with the work of Young, Helmholtz and Maxwell in the early nineteenth century, who recognized the principles of additive and subtractive colour mixing, and proposed the trichromatic nature of human colour vision.
The science began to be formalized in 1931, when the Commission International de l'Eclairage (CIE) recommended a system of colour specification based on the three tristimulus values X, Y and Z.


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