Scarlet moon weekly tarot scorpio

Red illumination was and sometimes still is used as a safelight while working in a darkroom as it does not expose most photographic paper and some films. On the color wheel long used by painters, and in traditional color theory, red is one of the three primary colors , along with blue and yellow.

Painters in the Renaissance mixed red and blue to make violet: Cennino Cennini , in his 15th-century manual on painting, wrote, "If you want to make a lovely violet colour, take fine lac [red lake], ultramarine blue the same amount of the one as of the other with a binder" he noted that it could also be made by mixing blue indigo and red hematite. In modern color theory, also known as the RGB color model , red, green and blue are additive primary colors. Red, green and blue light combined together makes white light, and these three colors, combined in different mixtures, can produce nearly any other color.

This is the principle that is used to make all of the colors on your computer screen and your television. For example, magenta on a computer screen is made by a similar formula to that used by Cennino Cennini in the Renaissance to make violet, but using additive colors and light instead of pigment: it is created by combining red and blue light at equal intensity on a black screen. Violet is made on a computer screen in a similar way, but with a greater amount of blue light and less red light.

See Web colors and RGB color model.

In a traditional color wheel from , red, yellow and blue are primary colors. Red and yellow make orange, red and blue make violet. In modern color theory, red, green and blue are the additive primary colors, and together they make white. A combination of red, green and blue light in varying proportions makes all the colors on your computer screen and television screen.

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Tiny Red, green and blue sub-pixels enlarged on left side of image create the colors you see on your computer screen and TV. As a ray of white sunlight travels through the atmosphere to the eye, some of the colors are scattered out of the beam by air molecules and airborne particles due to Rayleigh scattering , changing the final color of the beam that is seen. Colors with a shorter wavelength, such as blue and green, scatter more strongly, and are removed from the light that finally reaches the eye.

The remaining reddened sunlight can also be scattered by cloud droplets and other relatively large particles, which give the sky above the horizon its red glow. Lasers emitting in the red region of the spectrum have been available since the invention of the ruby laser in In the red helium—neon laser was invented, [20] and these two types of lasers were widely used in many scientific applications including holography , and in education.

Red helium—neon lasers were used commercially in LaserDisc players. Today, red and red-orange laser diodes are widely available to the public in the form of extremely inexpensive laser pointers. Portable, high-powered versions are also available for various applications. Red's wavelength has been an important factor in laser technologies; red lasers, used in early compact disc technologies, are being replaced by blue lasers, as red's longer wavelength causes the laser's recordings to take up more space on the disc than would blue-laser recordings.

Mars appears to be red because of iron oxide on its surface. The red giant called Mira , a star which is glowing from thermonuclear fusion. Artist's impression of a red dwarf , a small, relatively cool star that appears red instead of white because of its lower temperature. Red is commonly associated with flames and fire, but flames are almost always yellow, orange or blue.


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Coals are in the red spectrum, as are most burning items. Hematite , or iron ore, is the source of the red color of red ochre. Red ochre cliffs near Roussillon in France. Red ochre is composed of clay tinted with hematite.

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Ochre was the first pigment used by man in prehistoric cave paintings. The mineral cinnabar , the ore of mercury , is the source of the color vermilion. Mercury is highly toxic, and working in the mines was often a death sentence for the miners. Vermilion pigment, made from cinnabar. This was the pigment used in the murals of Pompeii and to color Chinese lacquerware beginning in the Song dynasty.

Despite its yellow greenish flower, the roots of the Rubia tinctorum , or madder plant, produced the most common red dye used from ancient times until the 19th century.


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Red lead , also known as minium , has been used since the time of the ancient Greeks. Chemically it is known as lead tetroxide. The Romans prepared it by the roasting of lead white pigment. It was commonly used in the Middle Ages for the headings and decoration of illuminated manuscripts. Dragon's blood is a bright red resin that is obtained from different species of a number of distinct plant genera: Croton , Dracaena , Daemonorops , Calamus rotang and Pterocarpus.

The red resin was used in ancient times as a medicine , incense , dye and varnish for making violins in Italy. The tiny female cochineal insect of Spanish Mexico on the left , was crushed to make the deep crimson color used in Renaissance costumes. Extract of carmine , made by crushing cochineal and other scale insects which feed on the sap of live oak trees. Also called kermes , it was used from the Middle Ages until the 19th century to make crimson dye.

Now it is used as a coloring for yoghurt and other food products. The Sappanwood tree, native to India, Malaysia and Sri Lanka , and later the related Brazilwood tree shown here , from the coast of South America, were the source of a popular red pigment and dye called brazilin. The red wood was ground to powder and mixed with an alkaline solution.

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The brazilwood gave its name to the nation of Brazil. Alizarin was the first synthetic red dye, created by German chemists in It duplicated the colorant in the madder plant, but was cheaper and longer lasting. After its introduction, the production of natural dyes from the madder plant virtually ceased. Red lac , also called red lake , crimson lake or carmine lake , was an important red pigment in Renaissance and Baroque art. Since it was translucent, thin layers of red lac were built up or glazed over a more opaque dark color to create a particularly deep and vivid color. Unlike vermilion or red ochre , made from minerals, red lake pigments are made by mixing organic dyes, made from insects or plants, with white chalk or alum.

Red lac was made from the gum lac , the dark red resinous substance secreted by various scale insects, particularly the Laccifer lacca from India.

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Other red lakes were made from the rose madder plant and from the brazilwood tree. Red lake pigments were an important part of the palette of 16th-century Venetian painters, particularly Titian , but they were used in all periods. It is banned in Denmark, Belgium, France and Switzerland, and was also banned in Sweden until the country joined the European Union in It is used in some tattoo inks and is used in many products, such as soft drinks , children's medications, and cotton candy.

Because of public concerns about possible health risks associated with synthetic dyes, many companies have switched to using natural pigments such as carmine , made from crushing the tiny female cochineal insect. This insect, originating in Mexico and Central America, was used to make the brilliant scarlet dyes of the European Renaissance. The red of autumn leaves is produced by pigments called anthocyanins. They are not present in the leaf throughout the growing season, but are actively produced towards the end of summer. Their formation depends on the breakdown of sugars in the presence of bright light as the level of phosphate in the leaf is reduced.

During the summer growing season, phosphate is at a high level. It has a vital role in the breakdown of the sugars manufactured by chlorophyll.

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But in the fall, phosphate, along with the other chemicals and nutrients, moves out of the leaf into the stem of the plant. When this happens, the sugar-breakdown process changes, leading to the production of anthocyanin pigments. The brighter the light during this period, the greater the production of anthocyanins and the more brilliant the resulting color display. When the days of autumn are bright and cool, and the nights are chilly but not freezing, the brightest colorations usually develop.

Anthocyanins temporarily color the edges of some of the very young leaves as they unfold from the buds in early spring. They also give the familiar color to such common fruits as cranberries , red apples , blueberries , cherries , raspberries , and plums. These same pigments often combine with the carotenoids' colors to create the deeper orange, fiery reds, and bronzes typical of many hardwood species.

See Autumn leaf color. Oxygenated blood is red due to the presence of oxygenated hemoglobin that contains iron molecules, with the iron components reflecting red light.

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Plants like apples , strawberries , cherries , tomatoes , peppers , and pomegranates are often colored by forms of carotenoids , red pigments that also assist photosynthesis. Red blood cell agar.