Color of Light Is Identified by Its:
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The Science of Color
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| Sir Isaac Newton experimenting with a prism. Engraving after a picture by J.A. Houston, ca. 1870. Courtesy of The Granger Collection, New York |
In the 1660s, English physicist and mathematician Isaac Newton began a series of experiments with sunlight and prisms. He demonstrated that clear white light was composed of seven visible colors.
By scientifically establishing our visible spectrum (the colors we see in a rainbow), Newton laid the path for others to experiment with color in a scientific manner. His work led to breakthroughs in optics, physics, chemistry, perception, and the study of color in nature.
Aristotle developed the first known theory of color believing it was sent by God from heaven through celestial rays of light. He suggested that all colors came from white and black (lightness and darkness) and related them to the four elements – water, air, earth, and fire. Aristotle's beliefs on color were widely held for over 2000 years until being replaced by those of Newton.
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| Sir Isaac Newton |
Opticks, one of the great works in the history of science, documents Newton's discoveries from his experiments passing light through a prism. He identified the ROYGBIV colors (red, orange, yellow, green, blue, indigo, and violet) that make up the visible spectrum. The visible spectrum is the narrow portion within the electromagnetic spectrum that can be seen by the human eye. Other forms of electromagnetic radiation, waves of energy, that we cannot see include radio, gamma and microwaves. The cells in our eyes called cones are sensitive to the wavelengths found in the visible spectrum. They allow us to see the all the colors of the rainbow.
…if the Sun's Light consisted of but one sort of Rays, there would be but one Colour in the whole World…
–Sir Isaac Newton, Opticks
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| Johann Wolfgang von Goethe | ||
Goethe challenged Newton's views on color, arguing that color was not simply a scientific measurement, but a subjective experience perceived differently by each viewer. His contribution was the first systematic study on the physiological effects of color. Goethe's views were widely adopted by artists. Although Goethe is best known for his poetry and prose, he considered Theory of Colors his most important work.
Colour are light's suffering and joy.
–Johann Wolfgang von Goethe
This very rare book formed the foundation for modern color printing. Le Blon was the first to outline a three-color printing method using primary colors (red, yellow, blue) to create secondary colors (green, purple, orange). He makes an important distinction between "material colors," as used by painters, and colored light, which was the focus of Newton's color theories. Le Blon's distinction marks the first documentation of what is now referred to as additive and subtractive color systems. Rainbows, TVs, computer screens and mobile devices all emit light and are examples of an additive color system (the subject of Newton's Opticks). Red, green and blue are the primary additive colors and when combined they produce transparent white light. Books, paintings, grass and cars are examples of a subtractive color system which is based on the chemical makeup of an object and its reflection of light as a color. Subtractive primary colors - blue, red, and yellow – are often taught to us as children, and when mixed together they create black.
…I arriv'd at the skill of reducing the Harmony of Colouring in painting to Mechanical Practice…
–J.C. Le Blon, Coloritto
These colorful line diagrams reveal the chemical compositions of metals. When a pure metal is burned and viewed through a spectroscope, each element gives off unique spectra, a sort of color fingerprint. This method, called spectral analysis, led to the discovery of new elements, and marked the first steps towards quantum theory.
Can you see the numbers in the circles? 4.5 percent of the population cannot see the entire visible spectrum, a condition called color vision deficiency, or color blindness. Ishihara plates are used to test patients for the various types of color blindness.
Can you find the animal hiding in this image? Camouflage uses color to conceal forms by creating optical illusions. American artist Abbott Thayer introduced the concept ofdisruptive patterning, in which an animal's uneven markings can disguise its outline. In this illustration Thayer shows how a peacock can disappear into its surroundings.
Thayer, an American artist, devoted much of his life to understanding how animals conceal themselves in nature for survival. In his book, Concealing Coloration in the Animal Kingdom, Thayer presented his beliefs of protective coloration as an essential factor in evolution helping animals disguise themselves from predators. He received much praise and criticism. He was extreme in his views arguing that all animal coloration was for protective purposes and failing to recognize other possible reasons such as sexual selection – characteristics for attracting a mate. Teddy Roosevelt most notably attacked his theories by pointing out that this concealment doesn't last all season, or even all day, but was dependent on a single frozen moment in times. Despite these shortcomings, Thayer went on to be the first to propose camouflage for military purposes. Although his suggestions were initially rejected, his former students were among the founders of the American Camouflage Society in 1916 and his theories were eventually adopted and are still used today.
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| Albatross D.Va, 1917-1918 Courtesy of the National Air and Space Museum |
The colorful pattern on this German aircraft from World War I is called lozenge camouflage. Its disruptive pattern applied Abbott Thayer's theories in an effort to inhibit enemy observation from the air and on the ground.
Color of Light Is Identified by Its:
Source: https://library.si.edu/exhibition/color-in-a-new-light/science