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In nature, many blue phenomena arise from structural colouration, the result of interference between reflections from two or more surfaces of thin films, combined with refraction as light enters and exits such films. The geometry then determines that at certain angles, the light reflected from both surfaces interferes constructively, while at ...
The first meaning is Nymphaea nouchali, the "blue lotus", also known as kuvalaya in Sanskrit. [1] [2] The second meaning of utpala is a variety of medicinal plant known as ' kooṭh ' in Hindi and ' kusṭham, vyādhi, paribhavyam or pāribhavyam, vāpyam, pākalam' according to Amarkośa. [3] [4] [5] [6]
The color azure ultimately takes its name from the vivid-blue gemstone lapis lazuli, a metamorphic rock. Lapis is the Latin word for "stone" and lāzulī is the genitive form of the Medieval Latin lāzulum , which is taken from the Arabic لازورد lāzaward [laːzwrd] ( listen ⓘ ), itself from the Persian لاژورد lāžaward , which ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 January 2025. Color "Sky (color)" redirects here. For other uses, see Sky Blue (disambiguation). Sky blue Common connotations boys, daylight, water, air, paleness Colour coordinates Hex triplet #87CEEB sRGB B (r, g, b) (135, 206, 235) HSV (h, s, v) (197°, 43%, 92%) CIELCh uv (L, C, h) (79, 46, 223 ...
Blue was a latecomer among colors used in art and decoration, as well as language and literature. [7] [verification needed] Reds, blacks, browns, and ochres are found in cave paintings from the Upper Paleolithic period, but not blue. Blue was also not used for dyeing fabric until long after red, ochre, pink and purple.
Copper phthalocyanine ("phthalo blue") is a synthetic blue pigment frequently used in paints and dyes. It is highly valued for its superior properties such as light fastness, tinting strength, covering power and resistance to the effects of alkalis and acids. It has the appearance of a blue powder, insoluble in most solvents including water. [5]
[10] [11] The blue iris is an example of a structural color because it relies only on the interference of light through the turbid medium to generate the color. Blue eyes and brown eyes, therefore, are anatomically different from each other in a genetically non-variable way because of the difference between turbid media and melanin.
A blue rose is a flower of the genus Rosa (family Rosaceae) that presents blue-to-violet pigmentation instead of the more common red, white, or yellow, through use of artificial means such as dyes. Blue roses are often used to symbolize mystery or the unattainable, [ 1 ] since they do not exist in nature because of genetic limitations.