If you blend light colors, blue and yellow will produce either a pale green or a white tint, depending on the precise blue and yellow colors you are mixing. When you combine paints or pigments, you will almost always obtain some shade of green. The color that results depends on the proportions of each pigment used. For example, if more of one pigment is used, it will be the dominant color. If you were to mix equal amounts of red and blue paint, the result would be purple rather than black.
The word "color" comes from the Latin word colorem, meaning "to dye." Colors are the natural products of plants and animals. They are found in all living things and are what give life to an object. Color exists in the physical world as wavelengths of light. The human eye can detect only certain ranges of these wavelengths, which is why some colors cannot be seen by everyone. Green, for example, is not visible to people who are color-blind.
In science, colors are the properties of objects that reflect light of different wavelengths. Colored objects can be classified according to their main color, such as red, orange, yellow, green, blue, indigo, and violet. Other colors include transparent and opaque materials. Opaque materials block light waves; transparent ones don't.
As a result, some individuals believe that yellow and blue combine to form green. The diagram below depicts what happens when a perfect yellow pigment is combined with an ideal blue pigment. The blue dye perfectly reflects light in approximately one-third of the visible range (and perfectly absorbs light in the other two-thirds). The yellow pigment does the same thing but only near half of the visible spectrum.
The combination of the two dyes results in both colors being reflected about one-half of the time, which is why some people think that green light is emitted. However, due to interference effects, no real green light is actually produced. Rather, the mixture of the two colors results in both colors being reflected more or less equally, depending on how close they are to each other on the color wheel. If you were to keep adding blue to yellow, it would eventually become red instead.
Because green is a blend of the two above, blue appears green in yellow light and yellow seems green in blue light. In addition, try holding a yellow object in front of a yellow light; it will seem white. If you hold up a blue object instead, it will appear black against the blue background.
This effect is called "color mixing" and it's how colors are created in nature. When light hits an object, it is split into different wavelengths-each wavelength corresponds to a particular color. If you mix these colors, you can create new colors. For example: red + green = purple; blue + yellow = orange; white + white = gray; etc. The more of one color there is, the more that color will dominate over the others. So if you increase the amount of red in something yellow, it will become more red than yellow.
In photography, this phenomenon is used to capture images with only certain parts of the spectrum. For example, if you want to photograph flowers but not their background, you could do so by using a colored filter to block out everything else but the reds, blues, and greens of the flowers' colors.
Also, many lasers use this same concept to produce different colors of light. Lasers at least partly consist of photons of red, blue, and green light which are mixed to create other colors.
White light is created by combining red, green, and blue light. The fundamental colors of light are defined as red, green, and blue (RGB). As depicted on the color wheel or circle on the right, mixing the colors creates new hues. This is a color that is added.
The rainbow-like colors of light are created by using filters to select specific wavelengths of light. These filters are called chromaticity filters or color wheels. They are used in optical systems to select colors from white light or other colored light. For example, one can use a filter to select only the red colors in sunlight by passing only those waves of light through it. Then only red colors would be displayed by a red display device such as an LED lamp or a laser projector.
Filters are made of materials that either absorb or reflect certain wavelengths of light. For example, one could use glass or plastic beads to filter out certain colors of light if one wanted to create a colored light source for decoration or playtime.
There are two types of chromaticity filters: monochromators and polychromators. A monochromator allows only one wavelength of light to pass through it at a time. This is how scientists study colors by selecting them from full spectrums of light. With a polychromator, many different colors can be passed through at once.