0_Wizard
I love the color red which is at the end of the visible light spectrum. It is next to orange and opposite of violet.
Red is the colour at the end of the visible spectrum of light, next to orange and opposite violet.
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Red
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Fluorescence
Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. The most striking example of fluorescence occurs when the absorbed radiation is in the ultraviolet region of the spectrum, and thus invisible to the human eye, while the emitted light is in the visible region, which gives the fluorescent substance a distinct color that can only be seen when exposed to UV light. Fluorescent materials cease to glow immediately when the radiation source stops, unlike phosphorescence, where they continue to emit light for some time after.
Grow light
A grow light or plant light is an artificial light source, generally an electric light, designed to stimulate plant growth by emitting a light appropriate for photosynthesis. Grow lights are used in applications where there is either no naturally occurring light, or where supplemental light is required. For example, in the winter months when the available hours of daylight may be insufficient for the desired plant growth, lights are used to extend the time the plants receive light. If plants do not receive enough light, they will grow long and spindly. Grow lights either attempt to provide a light spectrum similar to that of the sun, or to provide a spectrum that is more tailored to the needs of the plants being cultivated.
Color
Color (American English) or colour (Commonwealth English) is the characteristic of human visual perception described through color "categories", with names such as red, blue, yellow, green, orange, or purple. This perception of color derives from the stimulation of cone cells in the human eye by electromagnetic radiation in the spectrum of light. Color categories and physical specifications of color are associated with objects through the wavelength of the light that is reflected from them. This reflection is governed by the object's physical properties such as light absorption, emission spectra, etc.
Metamaterial cloaking
Metamaterial cloaking is the usage of metamaterials in an invisibility cloak. This is accomplished by manipulating the paths traversed by light through a novel optical material. Metamaterials direct and control the propagation and transmission of specified parts of the light spectrum and demonstrate the potential to render an object seemingly invisible. Metamaterial cloaking, based on transformation optics, describes the process of shielding something from view by controlling electromagnetic radiation. Objects in the defined location are still present, but incident waves are guided around them without being affected by the object itself.
Light-emitting diode
A light-emitting diode (LED) is a two-lead semiconductor light source. It is a p–n junction diode that emits light when activated. When a suitable voltage is applied to the leads, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence, and the color of the light (corresponding to the energy of the photon) is determined by the energy band gap of the semiconductor. LEDs are typically small (less than 1 mm) and integrated optical components may be used to shape the radiation pattern. Appearing as practical electronic components in 1962, the earliest LEDs emitted low-intensity infrared light.
Infrared photography
In infrared photography, the film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. Wavelengths used for photography range from about 700 nm to about 900 nm. Film is usually sensitive to visible light too, so an infrared-passing filter is used; this lets infrared (IR) light pass through to the camera, but blocks all or most of the visible light spectrum (the filter thus looks black or deep red). ("Infrared filter" may refer either to this type of filter or to one that blocks infrared but passes other wavelengths.)
Ultraviolet
Ultraviolet (UV) is an electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays. UV radiation constitutes about 10% of the total light output of the Sun, and is thus present in sunlight. It is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights. Although it's not considered an ionizing radiation because its photons lack the energy to ionize atoms, long-wavelength ultraviolet radiation can cause chemical reactions and causes many substances to glow or fluoresce. Consequently, the chemical and biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules.
1_Apprentice
It is a very symbolic color, for sure!
0_Wizard
Yes! The Mayans and Ancient Egyptians colored their faces red for ceremonies. Roman generals also colored their bodies red to celebrate if they had a victory.
The Ancient Egytians and Mayans coloured their faces red in ceremonies; Roman generals had their bodies colored red to celebrate victories.
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Red
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Red
Red is the colour at the end of the visible spectrum of light, next to orange and opposite violet. It has a dominant wavelength of approximately 625–740 nanometres. It is a primary color in the RGB color model and the CMYK color model, and is the complementary color of cyan. Reds range from the brilliant yellow-tinged scarlet and vermillion to bluish-red crimson, and vary in shade from the pale red pink to the dark red burgundy. The red sky at sunset results from Rayleigh scattering, while the red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide.
Ancient Egypt
Ancient Egypt was a civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River in the place that is now the country Egypt. It is one of six historic civilizations to arise independently. Egyptian civilization followed prehistoric Egypt and coalesced around 3100 BC (according to conventional Egyptian chronology) with the political unification of Upper and Lower Egypt under Menes (often identified with Narmer). The history of ancient Egypt occurred as a series of stable kingdoms, separated by periods of relative instability known as Intermediate Periods: the Old Kingdom of the Early Bronze Age, the Middle Kingdom of the Middle Bronze Age and the New Kingdom of the Late Bronze Age.
Ancient Egyptian race controversy
The question of the race of ancient Egyptians was raised historically as a product of the early racial concepts of the 18th and 19th centuries, and was linked to models of racial hierarchy primarily based on craniometry, anthropometry and genetics. A variety of views circulated about the racial identity of the Egyptians and the source of their culture. These were typically identified in terms of a distinction between the Caucasoid and Negroid racial categories. Some scholars argued that ancient Egyptian culture was influenced by other Afroasiatic-speaking populations in Northeast Africa, the Maghreb, or the Middle East, while others pointed to influences from various Nubian groups or populations in Europe.
Egyptians
Egyptians (  ; ""; ; "Ni/rem/en/kīmi") are an ethnic group native to Egypt and the citizens of that country sharing a common culture and a common dialect known as Egyptian Arabic. Egyptian identity is closely tied to geography. The population of Egypt is concentrated in the lower Nile Valley, the small strip of cultivable land stretching from the First Cataract to the Mediterranean and enclosed by desert both to the east and to the west. This unique geography has been the basis of the development of Egyptian society since antiquity. The daily language of the Egyptians is the local variety of Arabic, known as Egyptian Arabic or "Masri.
Black Egyptian hypothesis
The Black Egyptian hypothesis is the hypothesis that ancient Egypt was a predominantly Black civilization, as the term is currently understood in modern American ethnic perception. Mainstream scholars recognize that many indigenous Egyptians (e.g. Nubians), including several Pharaohs, were of ancestry that, in the modern era, would be considered "black". The Black Egyptian hypothesis goes much further, claiming that Egypt, from north to south, was a black civilization. It includes a particular focus on identifying links to Sub-Saharan cultures and the questioning of the race of specific notable individuals from Dynastic times, including Tutankhamun, the king represented in the Great Sphinx of Giza, and Cleopatra.
Ancient Egyptian technology
Ancient Egyptian technology describes devices and technologies invented or used in Ancient Egypt. The Egyptians invented and used many simple machines, such as the ramp and the lever, to aid construction processes. They used rope trusses to stiffen the beam of ships. Egyptian paper, made from papyrus, and pottery were mass-produced and exported throughout the Mediterranean basin. The wheel was used for a number of purposes, but chariots only came into use after the Second Intermediate period. The Egyptians also played an important role in developing Mediterranean maritime technology including ships and lighthouses.
Population history of Egypt
Egypt has a long and involved demographic history. This is partly due to the territory's geographical location at the crossroads of several major cultural areas: Northeast Africa, the Maghreb, the Sahara, Sub-Saharan Africa, the Middle East, and the Mediterranean. In addition, Egypt has experienced several invasions during its long history, including by the Canaanites, the Ancient Libyans, the Assyrians, the Kushites (a Nubian civilization), the Persians, the Greeks, the Romans, and the Arabs. During the Paleolithic period, the Nile Valley was inhabited by various hunter-gatherer populations. Around 8000 BCE, the Sahara had a wet phase, the Neolithic Subpluvial (Holocene Wet Phase).
1_Apprentice
That makes sense! It is the color of blood after all. I think purple had a lot of symbolism back then too didn't it?
0_Wizard
Definitely! Purple is associated with royalty, mystery, piety and mystery.
According to surveys in Europe and the U.S., purple is the color most often associated with royalty, magic, mystery and piety.
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Purple
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Purple
Purple is a color intermediate between blue and red. It is similar to violet, but unlike violet, which is a spectral color with its own wavelength on the visible spectrum of light, purple is a composite color made by combining red and blue. According to surveys in Europe and the U.S., purple is the color most often associated with royalty, magic, mystery and piety. When combined with pink, it is associated with eroticism, femininity and seduction. Purple was the color worn by Roman magistrates; it became the imperial color worn by the rulers of the Byzantine Empire and the Holy Roman Empire, and later by Roman Catholic bishops.
List of Scooby-Doo characters
This is a list of "Scooby-Doo" characters. Scooby-Doo is an American animated franchise based around several animated television series and animated, as well as live action, movies. There are five main characters in the franchise: Scooby-Doo, Shaggy Rogers, Fred Jones, Velma Dinkley, and Daphne Blake—known as "Mystery Incorporated". There are also several recurring characters throughout the franchise, including their parents, friends, allies, and enemies. The original series, "Scooby-Doo, Where Are You? ", premiered in 1969, and has spawned off many follow-up series, and several direct-to-DVD movies.
Royalty payment
A royalty is a payment made by one party, the licensee or franchisee to another that owns a particular asset, the licensor or franchisor for the right to ongoing use of that asset. Royalties are typically agreed upon as a percentage of gross or net revenues derived from the use of an asset or a fixed price per unit sold of an item of such, but there are also other modes and metrics of compensation. A royalty interest is the right to collect a stream of future royalty payments. A license agreement defines the terms under which a resource or property are licensed by one party to another, either without restriction or subject to a limitation on term, business or geographic territory, type of product, etc.
Euthyphro
Euthyphro (; ), [ca. 399–395 BC (Steph. 2a–16a)], by Plato, is a Socratic dialogue whose events occur in the weeks before the trial of Socrates (399 BC), for which Socrates and Euthyphro attempt to establish a definitive meaning for the word "piety" (virtue). The "Euthyphro" dialogue occurs near the court of the "Archon basileus" (Magistrate–king), where Socrates and Euthyphro encounter each other; each man is present at the court for the preliminary hearings to possible trials (2a). Euthyphro has come to present charges of murder against his father, who had allowed one of his workers to die of exposure to the elements without proper care and attention.
List of Strawberry Shortcake characters
This is a list of "Strawberry Shortcake" characters. There are (at this writing) four distinct continuities in which Strawberry Shortcake's adventures take place: The original, 1980s version, the 2003 reboot, the 2009/2010 reboot and the upcoming 2018 reboot. Many of Strawberry Shortcake's friends appear in more than one continuity, and their appearance and/or characterization can vary greatly between versions. Distinct traits will be noted in each of the circas in which a character happens to appear. Strawberry Shortcake is the protagonist and the title character of "The World of Strawberry Shortcake" franchise.
Affective piety
Affective piety is most commonly described as a style of highly emotional devotion to the humanity of Jesus, particularly in his infancy and his death, and to the joys and sorrows of the Virgin Mary. It was a major influence on many varieties of devotional literature in late-medieval Europe, both in Latin and in the vernaculars. : This practice of prayer, reading, and meditation was often cultivated through concentration on vivid images of scenes from the Bible, Saints' Lives, and other religious material. These images could be either conjured up in people's minds when they read or heard poetry and other pieces of religious literature, or they could gaze on manuscript illuminations and other pieces of art as they prayed and meditated on the scenes depicted.
The Mystery of the Sea
The Mystery of the Sea, a mystery novel by Bram Stoker, was originally published in 1902. Stoker is best known for his 1897 novel "Dracula", but "The Mystery of the Sea" contains many of the same compelling elements. It tells the story of an Englishman living in Aberdeenshire, Scotland, who meets and falls in love with an American heiress. She is involved with the intrigues of the Spanish–American War, and a complex plot involving second sight, kidnapping, and secret codes unfolds over the course of the novel. "The Mystery of the Sea" contains supernatural elements, but is in many respects a political thriller.
1_Apprentice
Very cool. I wonder if purple dye and red dyes were difficult to make back then? How would they even get access to those colors?
0_Wizard
Most dies are made from vegetables and plants such as berries, leaves and roots. 
The majority of natural dyes are vegetable dyes from plant sources—roots, berries, bark, leaves, and wood—and other biological sources such as fungi and lichens.
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Natural dye
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Philodendron
Philodendron is a large genus of flowering plants in the Araceae family. , the World Checklist of Selected Plant Families accepted 489 species; other sources accept different numbers. Regardless of number of species, the genus is the second-largest member of the Araceae family. Taxonomically, the genus "Philodendron" is still poorly known, with many undescribed species. Many are grown as ornamental and indoor plants. The name derives from the Greek words "philo-" or "love, affection" and "dendron" or "tree". They are commonly called by their generic name. Compared to other genera of the family Araceae, philodendrons have an extremely diverse array of growth methods.
Fungicide use in the United States
A more accurate title for this page would be "Common plant pathogens to food crops in the United States". Symptoms of Alternaria leaf spot appear as lesions with tan spots on the leaves. The centers of these lesions become black with fungal sporulation. This infection can lead to tree death within 3–4 years of the first serious outbreak. Orchards in high humidity areas result in the largest yield loss, often in excess of 50%. Yield loss tends to rise every year as the tree becomes weaker each year after infection. Three fungicide applications can achieve 60–80% control of leaf spot. Anthracnose was not seen on California almonds until the early 1990s.
Berry
In everyday language, a berry is a small, pulpy, and often edible fruit. Berries are usually juicy, rounded, brightly colored, sweet or sour, and do not have a stone or pit, although many pips or seeds may be present. Common examples are strawberries, raspberries, blueberries, red currants, and blackcurrants. In Britain, soft fruit is a horticultural term for such fruits. The scientific usage of the term "berry" differs from common usage. In scientific terminology, a berry is a fruit produced from the ovary of a single flower in which the outer layer of the ovary wall develops into an edible fleshy portion (pericarp).
Atropa baetica
Atropa baetica is one of Europe's rarest wildflowers. A close relative of the infamous deadly nightshade ("Atropa belladonna") its specific name derives from that of the Roman province of Hispania Baetica, while its common name refers to the Spanish region of Andalucía – both designating the area in the south of Spain where it is most frequently encountered. It is an attractive, perennial herbaceous plant bearing infundibuliform (i.e. funnel-shaped), yellow or greenish flowers and shiny, black berries. Like the other three (generally accepted) species of Atropa, it is an extremely poisonous plant, containing a variety of tropane alkaloids with anticholinergic, deliriant, antispasmodic and mydriatic properties.
Yup'ik cuisine
Yup'ik cuisine ("Yupiit neqait" in Yup'ik language, literally "Yup'iks' foods" or "Yup'iks' fishes") refers to the Eskimo style traditional subsistence food and cuisine of the Yup'ik people from the western and southwestern Alaska. Also known as Cup'ik cuisine for the Chevak Cup'ik dialect speaking Eskimos of Chevak and Cup'ig cuisine for the Nunivak Cup'ig dialect speaking Eskimos of Nunivak Island. This cuisine is traditionally based on meat from fish, birds, sea and land mammals, and normally contains high levels of protein. Subsistence foods are generally considered by many to be nutritionally superior superfoods.
Tree
In botany, a tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height. Trees are not a taxonomic group but include a variety of plant species that have independently evolved a woody trunk and branches as a way to tower above other plants to compete for sunlight. Trees tend to be long-lived, some reaching several thousand years old. In looser definitions, the taller palms, tree ferns, bananas and bamboos are also trees.
Berry (botany)
In botany, a berry is a fleshy fruit without a stone produced from a single flower containing one ovary. Berries so defined include grapes, currants, and tomatoes, as well as cucumbers, eggplants (aubergines) and bananas, but exclude certain fruits commonly called berries, such as strawberries and raspberries. The berry is the most common type of fleshy fruit in which the entire outer layer of the ovary wall ripens into a potentially edible "pericarp". Berries may be formed from one or more carpels from the same flower (i.e. from a simple or a compound ovary). The seeds are usually embedded in the fleshy interior of the ovary, but there are some non-fleshy exceptions, such as peppers, with air rather than pulp around their seeds.