KIN104 Lecture Notes - Lecture 6: Sindoor, Rayleigh Scattering, Gemstone
23 May 2020
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Document Summary
Red is the color at the end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625 740 nanometres. Rayleigh scattering, while the red color of the grand canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide. Iron oxide also gives the red color to the planet mars. The red color of blood comes from the protein hemoglobin, while ripe strawberries, red apples and reddish autumn leaves are colored by anthocyanins. Red pigment made from ochre was one of the first colors used in prehistoric art. The ancient egyptians and mayans colored their faces red in ceremonies; roman generals had their bodies colored red to celebrate victories. It was also an important color in china, where it was used to color early pottery and later the gates and walls of palaces.
