Instruct: Given a question, retrieve relevant passages that can help answer the question.
Query: When was cobalt first used for blue paint?
Cobalt blue in impure forms had long been used in Chinese porcelain, but it was independently discovered as a pure alumina-based pigment by Louis Jacques Thénard in 1802. Commercial production began in France in 1807. The first recorded use of "cobalt blue" as a color name in English was in 1777. The leading world manufacturer of cobalt blue in the 19th century was Benjamin Wegner's Norwegian company Blaafarveværket ("blue colour works" in Dano-Norwegian). Germany was also famous for production, especially the blue colour works ("Blaufarbenwerke") in the Ore Mountains of Saxony.
Parallel efforts to produce coloured photographic images affected the popularity of hand-colouring. In 1842 Daniel Davis Jr. patented a method for colouring daguerreotypes through electroplating, and his work was refined by Warren Thompson the following year. The results of the work of Davis and Thompson were only partially successful in creating colour photographs and the electroplating method was soon abandoned. In 1850 Levi L. Hill announced his invention of a process of daguerreotyping in natural colours in his "Treatise on Daguerreotype". Sales of conventional uncoloured and hand-coloured daguerreotypes fell in anticipation of this new technology. Hill delayed publication of the details of his process for several years, however, and his claims soon came to be considered fraudulent. When he finally did publish his treatise in 1856, the process – whether bona fide or not – was certainly impractical and dangerous.
In the late 1920s, Leo Moser (Moser glass-works Director General, 1916 to 1932) recombined praseodymium and neodymium in a 1:1 ratio to create his "Heliolite" glass ("Heliolit" in Czech), which has color-changing properties between amber, reddish, and green depending on the light source. This was one of a number of decorative glasses using rare earth colorants, with "Heliolit" and "Alexandrit" being the first two, introduced by Moser in 1929. Leo Moser's papers in the Corning Glass Museum make it clear that the first experimental glass melts done by Moser involving any of the rare earths occurred in November 1927. After a year of further development, the rare earth glasses were introduced to great acclaim at the Spring 1929 trade show in Leipzig. The Alexandrit and Heliolit names were registered as trademarks in June 1929. The earlier date of 1925 sometimes given for rare earth glass refers to an award for glass design, not glass composition.
Among a few well-known historic examples are the Scottish soldiers, who wore the blue bonnet in the 17th and 18th centuries, the "Volontaires Cantabres", a French force raised in the Basque country in the 1740s to the 1760s, who also wore a blue beret, and the Carlist rebels, with their red berets, in 1830s Spain. In World War Two, British officer Bernard Montgomery ("Monty") took to wearing a black beret given to him by a corporal, and it became his trademark. In the 1950s the U.S. Army's newly conceived Special Forces units began to wear a green beret as headgear, following the custom of the British Royal Marines, which was officially adopted in 1961 with such units becoming known as the "Green Berets", and additional specialised forces in the Army, U.S. Air Force and other services also adopted berets as distinctive headgear.
Lanthanum barium copper oxide, or LBCO, was discovered in 1986 and was the first high temperature superconductor. Johannes Georg Bednorz and K. Alex Müller shared the 1987 Nobel Prize in physics for its discovery.
Dr. Joseph Cecil Patrick (August 28, 1892 – April 12, 1965) invented Thiokol, America's first synthetic rubber in the early 1920s. While seeking a formulation for automotive antifreeze, he attempted to hydrolyze ethylene dichloride with sodium polysulfide. In doing so, he produced a brown, insoluble gum that later became known as Thiokol. He solved commercial production problems by inventing the suspension polymerization process, and solved compounding problems by degrading high molecular weight polymer to a low molecular weight liquid polymer. This material is one of the principal binders for rocket propellant.
Once the interior scaffolding was installed, a thorough evaluative survey of the interior coatings was executed. The acknowledged presumption of most involved in the restoration was that all coatings would be removed from the interior metals, that repairs would be made, that metals would be recoated, and the interior would be adequately weatherproofed. The preexisting interior coatings on both the secondary wrought iron framework and the wrought iron central pylon would be removed along with the multiple layers of coal tar and paint that had been applied to the internal copper sheathing. A "New York Times" article from February 8, 1984, mentioned that the interior copper which was at that time painted "government green" would be cleaned to resemble the salmon color of a new penny. That outermost "government green" layer was a vinyl paint applied in 1975.
Because certain sections that had corroded were hidden beneath the layers of coatings, no attempt was made to salvage any of the seven layers of paint, (consisting of a base coat of red lead primer plus six additional coats) and the two layers of bituminous paint (a coal tar coating) that had been used as a water sealant in the statues interior around 1911. The three available coating removal methods tested, developed (or not) and implemented (or not) were: thermal coating removal, abrasive coating removal and chemical coating removal. The methods contemplated for the removal of the coatings on the interior copper differed from that of the other interior metals. For the preparation of the wrought iron parts of the statue, an abrasive removal method also known as dry sandblasting was implemented in order to prevent against flash rusting, The low dusting abrasive material used in the dry sandblasting technique was aluminum oxide.
Originally, the statue was a dull copper color, but shortly after 1900 a green patina, also called verdigris, caused by the oxidation of the copper skin, began to spread. As early as 1902 it was mentioned in the press; by 1906 it had entirely covered the statue. Believing that the patina was evidence of corrosion, Congress authorized for various repairs, and to paint the statue both inside and out. There was considerable public protest against the proposed exterior painting. The Army Corps of Engineers studied the patina for any ill effects to the statue and concluded that it protected the skin, "softened the outlines of the Statue and made it beautiful." The statue was painted only on the inside. The Corps of Engineers also installed an elevator to take visitors from the base to the top of the pedestal.
Verdigris is the common name for a green pigment obtained through the application of acetic acid to copper plates or the natural patina formed when copper, brass or bronze is weathered and exposed to air or seawater over a period of time. It is usually a basic copper carbonate, but near the sea will be a basic copper chloride. If acetic acid is present at the time of weathering, it may consist of copper(II) acetate.
The achromatic lens, which greatly reduced color aberrations in objective lenses and allowed for shorter and more functional telescopes, first appeared in a 1733 telescope made by Chester Moore Hall, who did not publicize it. John Dollond learned of Hall's invention and began producing telescopes using it in commercial quantities, starting in 1758.
Cast iron was first produced in China during 5th century BC, but was hardly in Europe until the medieval period. The earliest cast iron artifacts were discovered by archaeologists in what is now modern Luhe County, Jiangsu in China. Cast iron was used in ancient China for warfare, agriculture, and architecture. During the medieval period, means were found in Europe of producing wrought iron from cast iron (in this context known as pig iron) using finery forges. For all these processes, charcoal was required as fuel.
The Winston Blue is the name given to what was the largest flawless vivid blue diamond bought by Harry Winston, Inc. (a wholly owned subsidiary of The Swatch Group from January 2013) on May 15, 2014, from an anonymous person for $23.8 million at Christie's Geneva Magnificent Jewels sale. The approximately $1.8003 million per carat price paid for the 13.22-carat diamond is a world record for a blue diamond. Harry Winston, Inc. had also bought a 101.73-carat colorless diamond named Winston Legacy at Christie's Geneva jewelry auction in 2013. The American luxury jeweler had then paid $26.7 million for the colorless diamond ($254,400 per carat), which is a world record for the highest price paid per carat for a colorless diamond.
Indigo is natural dye from a plant (Indigofera tinctoria, suffructicosa, or arrecta) that can be added to henna or layered on top of it to create brown to black colors in the hair. Henna is orange, and indigo is blue, so as complementaries on a standard color wheel, the two colors' combined effect is to create brown tones. Like henna, indigo may fade after one application, but it becomes permanent on the hair with repeated use.
Another very notable practitioner was Adolf Miethe, with whom Prokudin-Gorsky studied in Germany in 1902. Miethe was a photochemist who greatly improved the panchromatic characteristics of the black-and-white photographic materials suitable for use with this method of color photography. He presented projected color photographs to the German Imperial Family in 1902 and was exhibiting them to the general public in 1903, when they also began to appear in periodicals and books. Miethe took the first known aerial color photographs, from a hot air balloon, in 1906.
Langenheim invented a technique in 1846 for coloring daguerreotype plates and was issued a patent for it. With his brother in 1849 Langenheim used a photography technique invented by Abel Niépce de Saint-Victor which produced negative lantern glass slides. They renamed it "hyalotype" photography and patented it in 1850. The hyalotype glass slides were produced by an albumen process and were used for views of historic buildings in New York City, Philadelphia, and Washington, D.C. These slides were also used in portraits of famous Americans. In 1850, Langenheim with his brother introduced stereoscopy and were the first Americans to sell stereocards to the public. Langenheim and his brother were the first to produce stereographs commercially in America. They operated the American Stereoscopic Company from about 1850 to 1860 in Philadelphia.
In 1912, the first patents for polyvinyl chloride (PVC) were founded in Britain and Germany. It was not until the early 1930s that PVC was able to be produced cheaply, limiting its marketable applications for the time. World War II helped make the substance popular, as manufacturers used it to make an assortment of items for soldiers. It was here that PVC’s water resistance was shown to be an important property, and tools made from PVC were used in many marine applications. After the war, PVC was not a popular choice of materials in the marine industry due to its density. In the 1970s, the need for a strong, moisture-resistant material led to plastic manufactures working with PVC to make it lighter. This led to the creation of PVC foamboard, by combining PVC with polyurea at the molecular level.
The earliest dyed flax fibres have been found in a prehistoric cave in the Georgia and date back to 36,000.
After the war, monochrome TV production began in earnest. Color TV was the next major development, and NBC once again won the battle. CBS had their electro-mechanical color television system approved by the FCC on October 10, 1950, but Sarnoff filed an unsuccessful suit in the United States district court to suspend that ruling. Subsequently, he made an appeal to the Supreme Court which eventually upheld the FCC decision. Sarnoff's tenacity and determination to win the "Color War" pushed his engineers to perfect an all-electronic color television system that used a signal that could be received on existing monochrome sets that prevailed. CBS was now unable to take advantage of the color market, due to lack of manufacturing capability and color programming, a system that could not be seen on the millions of black and white receivers and sets that were triple the cost of monochrome sets. A few days after CBS had its color premiere on June 14, 1951, RCA demonstrated a fully functional all-electronic color TV system and became the leading manufacturer of color TV sets in the US.
Whiteboards became commercially available in the early 1960s, but did not become widely used until 30 years later. Early whiteboards needed to be wiped with a damp cloth and markers had a tendency to leave marks behind, even after erasing the board. Dry-erase markers for whiteboards were invented in 1975.
The Copper Age is the early part of the Bronze Age. Bronze is made when tin is added to copper and brass is copper with zinc. Copper came into use before 5,000 BC and bronze around 3,100 BC, although the times vary by region. Copper and bronze were used for the same types of tools as stone such as axes and chisels, but the new, less brittle, more durable material cut better. Bronze was cast into desired shapes and if damaged could be recast. A new tool developed in the copper age is the saw. Other uses of copper and bronze were to "harden" the cutting edge of tools such as the Egyptians using copper and bronze points for working soft stone including quarrying blocks and making rock-cut architecture.
In the 1940s, CBS Laboratories invented an early color system that utilized a wheel, containing six color filters, rotated in front of a single video camera tube to generate the RGB signal. Called a field-sequential color system, it used interlaced video, with sequentially alternating color video fields to produce one complete video frame. That meant that the first field would be red, the second blue, and the third field green – matching the color filters on the wheel and also in a different order than NTSC. This system was both simpler and more reliable than a standard three-tube color camera, and more power-efficient.
Before the 19th century, cobalt was predominantly used as a pigment. It has been used since the Middle Ages to make smalt, a blue-colored glass. Smalt is produced by melting a mixture of roasted mineral smaltite, quartz and potassium carbonate, which yields a dark blue silicate glass, which is finely ground after the production. Smalt was widely used to color glass and as pigment for paintings. In 1780, Sven Rinman discovered cobalt green, and in 1802 Louis Jacques Thénard discovered cobalt blue. Cobalt pigments such as cobalt blue (cobalt aluminate), cerulean blue (cobalt(II) stannate), various hues of cobalt green (a mixture of cobalt(II) oxide and zinc oxide), and cobalt violet (cobalt phosphate) are used as artist's pigments because of their superior chromatic stability. Aureolin (cobalt yellow) is now largely replaced by more lightfast yellow pigments.
Its best-known pattern, "cobalt net", first appeared in 1949. The design is based on a blue net pattern that was painted on raised lines cast into the porcelain dinnerware pieces of Catherine the Great. The factory has actual examples of Catherine's dinnerware with this design. The new design pattern is a combination of intersecting lines of cobalt blue with inverted tear drops of cobalt blue (made from mineral cobalt) and 22 karat gold accents.
Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with alumina at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAlO. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue. It is extremely stable and has historically been used as a coloring agent in ceramics (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment smalt.
Cobalt is primarily used in the manufacture of magnetic, wear-resistant and high-strength alloys. The compounds cobalt silicate and cobalt(II) aluminate (CoAlO, cobalt blue) give a distinctive deep blue color to glass, ceramics, inks, paints and varnishes. Cobalt occurs naturally as only one stable isotope, cobalt-59. Cobalt-60 is a commercially important radioisotope, used as a radioactive tracer and for the production of high energy gamma rays.