Century eggs are made by preserving eggs in a mixture of clay, ash, salt and what kind of oxide?
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Century egg Century egg or Pidan (), also known as preserved egg, hundred-year egg, thousand-year egg, thousand-year-old egg, millennium egg and black egg, is a Chinese preserved food product and delicacy made by preserving duck, chicken or quail eggs in a mixture of clay, ash, salt, quicklime, and rice hulls for several weeks to several months, depending on the method of processing.
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Calcium oxide Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. The broadly used term "lime" connotes calcium-containing inorganic materials, in which carbonates, oxides and hydroxides of calcium, silicon, magnesium, aluminium, and iron predominate. By contrast, "quicklime" specifically applies to the single chemical compound calcium oxide. Calcium oxide that survives processing without reacting in building products such as cement is called free lime.
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Silicon dioxide Silicon dioxide, also known as silica (from the Latin "silex"), is an oxide of silicon with the chemical formula Si O , most commonly found in nature as quartz and in various living organisms. In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as synthetic product. Notable examples include fused quartz, fumed silica, silica gel, and aerogels. It is used in structural materials, microelectronics, and as components in the food and pharmaceutical industries.
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Potassium sulfate Potassium sulfate (KSO) (in British English potassium sulphate, also called sulphate of potash, arcanite, or archaically known as potash of sulfur) is a non-flammable white crystalline salt which is soluble in water. The chemical compound is commonly used in fertilizers, providing both potassium and sulfur.
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Chalkware Chalkware is an American term for popular figurines either made of moulded plaster of Paris (usually) or sculpted gypsum, and painted, typically with oils or watercolors. They were primarily created during one of three periods: from the late 18th century to the beginning of the 20th century, during the Great Depression, and during the 'mid-century modern' era as decorative lamps, figurines and wall decor from the 1940s-1960s. Those created during the earlier period were intended as a more serious decorative art, often imitating the more expensive imported English Staffordshire potteries figurines such as Staffordshire dog figurines; those during the second period, by contrast, were more typically somewhat jocular. Early chalkware was often hollow and is difficult to find unblemished.
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Tempera Tempera (] ), also known as egg tempera, is a permanent, fast-drying painting medium consisting of colored pigments mixed with a water-soluble binder medium (usually a glutinous material such as egg yolk or some other size). Tempera also refers to the paintings done in this medium. Tempera paintings are very long lasting, and examples from the first century AD still exist. Egg tempera was a primary method of painting until after 1500 when it was superseded by the invention of oil painting. A paint consisting of pigment and glue size commonly used in the United States as poster paint is also often referred to as "tempera paint," although the binders and sizes in this paint are different from traditional tempera paint.
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Bone china Bone china is a type of soft-paste porcelain that is composed of bone ash, feldspathic material, and kaolin. It has been defined as "ware with a translucent body" containing a minimum of 30% of phosphate derived from animal bone and calculated calcium phosphate. Bone china is the strongest of the porcelain or china ceramics, having very high mechanical strength and chip resistance, and is known for its high levels of whiteness and translucency. Its high strength allows it to be produced in thinner cross-sections than other types of porcelain. Like stoneware it is vitrified, but is translucent due to differing mineral properties.
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Sodium hypochlorite Sodium hypochlorite is a chemical compound with the formula NaClO. It is composed of a sodium cation (Na+ ) and a hypochlorite anion (ClO- ); it may also be viewed as the sodium salt of hypochlorous acid. When dissolved in water it is commonly known as bleach or liquid bleach. Sodium hypochlorite is practically and chemically distinct from chlorine. Sodium hypochlorite is frequently used as a disinfectant or a bleaching agent. The mixture of sodium peroxide (NaO) and hydrochloric acid, which react to produce sodium hypochlorite is also termed as oxone.
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Potash works A potash works (German: "Aschenhaus" , "Aschenhütte" or "Potaschhütte") was a subsidiary operation of a glassworks in the Early Modern Period. The latter needed potash, as well as quartz and lime as raw materials for the manufacture of glass. Potash acted as a flux in the production process, that is by mixing it with quartz sand it significantly reduced the melting point of the latter. To make potash the glassworks built potash huts or works in the vicinity, in which wood ash and vegetable ash was gathered by ash burners and initially washed in water and then vaporized; the whole process being known as leaching.
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Faience Faience or faïence ( or ; ] ) is the conventional name in English for fine tin-glazed pottery on a delicate pale buff earthenware body. It is originally associated by French speakers with wares exported from Faenza in northern Italy. The invention of a white pottery glaze suitable for painted decoration, by the addition of an oxide of tin to the slip of a lead glaze, was a major advance in the history of pottery. The invention seems to have been made in Iran or the Middle East before the ninth century. A kiln capable of producing temperatures exceeding 1000 C was required to achieve this result, the result of millennia of refined pottery-making traditions. The term is now used for a wide variety of pottery from several parts of the world, including many types of European painted wares, often produced as cheaper versions of porcelain styles.
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Louisville Stoneware Louisville Stoneware, previously known as Louisville Pottery, is located in the Highlands section of Louisville, Kentucky. Founded in 1815, making it one of the oldest stoneware companies in the United States, it creates fanciful stoneware that is nationally renowned. It specializes in decorating its pottery with Kentucky Derby and Christmas themes, but it has other themes as well: Noah's Ark, Primrose, and Pear being examples. They can also create personalized items. Besides pottery, they have made bird baths and bird feeders.
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Iron(II) sulfate Iron(II) sulfate (British English: iron(II) sulphate) or ferrous sulfate denotes a range of salts with the formula FeSO·"x"HO. These compounds exist most commonly as the heptahydrate ("x" = 7) but are known for several values of "x". The hydrated form is used medically to treat iron deficiency, and also for industrial applications. Known since ancient times as copperas and as green vitriol, the blue-green heptahydrate is the most common form of this material. All the iron(II) sulfates dissolve in water to give the same aquo complex [Fe(HO)], which has octahedral molecular geometry and is paramagnetic. The name copperas dates from times when the copper(II) sulfate was known as blue copperas, and perhaps in analogy, iron(II) and zinc sulfate were known respectively as green and white copperas.
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Aluminium sulfacetate Aluminium sulfacetate is a chemical compound of aluminium with formula Al2SO4(CH3CO2)4 . It is a double salt of aluminium sulfate and aluminium acetate. It can be used as a mordant, which is a substance used to set dyes on fabrics that typically contains a polyvalent metal ion like aluminium or iron, In mixtures with basic aluminium diacetate or aluminium sulfacetate, aluminium triacetate has been used as a mordant with alizarin dye. In 1899, Albert Ganswindt recommended that the use of impure sulfacetates that are empyreumatic liquids "should be abandoned" in favour of pure preparations. Empyreuma is an obsolete chemical and medical term referring to "the smell and taste associated with burning vegetable and animal matter", and likely results in this case from the use of pyroligneous acid (wood acid) or wood acid lime in the preparation of the mordant.
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Sodium triphosphate Sodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP),) is an inorganic compound with formula NaPO. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. It is produced on a large scale as a component of many domestic and industrial products, especially detergents. Environmental problems associated with eutrophication are attributed to its widespread use.
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Ammonium sulfide Ammonium sulfide, also known as diammonium sulfide, is an unstable salt with the formula (NH)S. Aqueous solutions purporting to contain this salt are commercially available. With a p"K" exceeding 15, the hydrosulfide ion cannot be deprotonated to an appreciable amount by ammonia. Thus, such solutions mainly consist of a mixture of ammonia and (NH)SH. Ammonium sulfide solutions are used occasionally in photographic developing, to apply patina to bronze, and in textile manufacturing. Also, due to its offensive smell, it is the active ingredient in a variety of foul pranks including the common stink bomb.
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Conpoy Conpoy or dried scallop is a type of Cantonese dried seafood product made from the adductor muscle of scallops. The smell of conpoy is marine, pungent, and reminiscent of certain salt-cured meats. Its taste is rich in umami due to its high content of various free amino acids, such as glycine, alanine, and glutamic acid. It is also rich in nucleic acids such as inosinic acid, amino acid byproducts such as taurine, and minerals, such as calcium and zinc .
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Amatol Amatol is a highly explosive material made from a mixture of TNT and ammonium nitrate. The British name originates from the words ammonium and toluene (a raw material of TNT). Similar mixtures (1 part dinitronaphthalene and 7 parts ammonium nitrate) were known as Schneiderite in France. Amatol was used extensively during World War I and World War II, typically as an explosive in military weapons such as aircraft bombs, shells, depth charges, and naval mines. It was eventually replaced with alternative explosives such as composition B, torpex, and tritonal.
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Portland cement Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydraulic lime in England in the mid 19th century, and usually originates from limestone. It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, grinding the clinker, and adding small amounts of other materials. Several types of Portland cement are available. The most common, called ordinary Portland cement (OPC), is grey in colour, but white Portland cement is also available. Its name is derived from its similarity to Portland stone which was quarried on the Isle of Portland in Dorset, England. It was named by Joseph Aspdin who obtained a patent for it in 1824. However his son William Aspdin is regarded as the inventor of "modern" Portland cement due to his developments in the 1840s.
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Pellets (petrology) Pellets are small spherical to ovoid or rod-shaped grains that are common component of many limestones. They are typically 0.03 to 0.3 mm long and composed of carbonate mud (micrite). Their most common size is 0.04 to 0.08 mm. Pellets typically lack any internal structure and are remarkably uniform in size and shape in any single limestone sample. They consist either of aggregated carbonate mud, precipitated calcium carbonate, or a mixture of both. They either are or were composed either of aragonite, calcite, or a mixture of both. Also, pellets composed of either glauconite or phosphorite are common in marine sedimentary rocks. Pellets occur in Precambrian through Phanerozoic strata. They are an important component mainly in Phanerozoic strata. The consensus among sedimentologists and petrographers is that pellets are the fecal products of invertebrate organisms because of their constant size, shape, and extra-high content of organic matter.
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Nile silt Nile silt or Nile mud is a ceramic paste employed widely within Ancient Egyptian pottery manufacture, sourced from local Quaternary Nile sediments.
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Aluminium arsenate Aluminium arsenate is a inorganic compound with the formula AlAsO. It is most commonly found as an octahydrate. It is a colourless solid that is produced by the reaction between sodium arsenate and a soluble aluminium salt. Aluminium arsenate occurs naturally as the mineral mansfieldite. A synthetic hydrate of aluminium arsenate is produced by hydrothermal method. with the formulation, AlO.3AsO10HO.<br>
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Curing salt Curing salts are used in food preservation to prevent or slow spoilage by bacteria or fungus. Generally they are used for pickling meats as part of the process to make sausage or cured meat. Curing salts are generally a mixture of table salt and sodium nitrite, which serves to inhibit the growth of bacteria, specifically "Clostridium botulinum" in an effort to prevent botulism, and helps preserve the color of cured meat. Many also contain red dye that makes them pink to prevent them from being confused with common table salt. Curing salts are not to be confused with Himalayan pink salt, which is pure salt with trace elements that give it a pink color.