Colorimetry
Colorimetry, sometimes Colorimetry, is a science that studies methods of measuring, expressing the amount of color and color differences that arose in the last century. The main role in its development was played by the discovery by the German mathematician G. Grassmann of the laws under which each color is the sum of three other colors taken in certain proportions. At the same time, such colors should be independent, that is, two of them, while mixing, should not give a third.