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Clearly, each strong rainbow coloring is also a rainbow coloring, while the converse is not true in general. It is easy to observe that to rainbow-connect any connected graph G {\displaystyle G} , we need at least diam ( G ) {\displaystyle {\text{diam}}(G)} colors, where diam ( G ) {\displaystyle {\text{diam}}(G)} is the diameter of G ...
A monochrome or red rainbow is an optical and meteorological phenomenon and a rare variation of the more commonly seen multicolored rainbow. Its formation process is identical to that of a normal rainbow (namely the reflection/refraction of light in water droplets), the difference being that a monochrome rainbow requires the sun to be close to ...
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The rainbow is curved because the set of all the raindrops that have the right angle between the observer, the drop, and the Sun, lie on a cone pointing at the sun with the observer at the tip. The base of the cone forms a circle at an angle of 40–42° to the line between the observer's head and their shadow but 50% or more of the circle is ...
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List of color palettes; List of Crayola crayon colors; ... Download as PDF; Printable version; In other projects Wikidata item; These are the lists of colors ...
The color observed is created entirely by the refractive properties of the flakes, analogous to the perception of rainbow colors in oil slicks. ChromaFlair paint has also been used as a substitute for optically variable ink in the use of counterfeiting the currency of the United States.