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Colorimeter
Colorimeter
Colorimeter

Some chemical compounds possess a distinctive color, such as the red of hemoglobin or the green of chlorophyll. One way of determining the concentration of a solution is comparing its color against a standard of a known concentration. Shown here is a type of colorimeter referred to as a Duboscq comparator. Notice that the two sample holders move independently, allowing one to match the intensity of the colors by varying the depth through which the samples are viewed. The concentration of albumin, blood sugar, calcium, hemoglobin and cholesterol could be determined with this device. Jules Duboscq developed this device in 1854, but did not publish it in English until 1870.

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