The synthesis of nitrilotriacetonitrile is based on the basic building blocks ammonia, formaldehyde and hydrogen cyanide, which are reacted (via the triple cyanomethylation of the ammonia) in acidic aqueous medium in discontinuous or continuous processes. Synthese von Nitrilotriacetonitril NTAN Ammonia is introduced as a gas, in form of hexamethylenetetramine or as ammonium sulfate together with formaldehyde as aqueous solution (usually 37% by weight) at pH values <2 and treated with aqueous blue acid solution or liquid hydrogen cyanide at temperatures around 100 °C. Blue acid is used directly from the Andrussow process or the BMA process of Evonik Degussa without pre-purification if necessary. When the mother liquors are returned, yields of more than 90% are achieved.
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Water blue, also known as aniline blue, Acid blue 22, Soluble Blue 3M, Marine Blue V, or C.I. 42755, is a chemical compound used as a stain in histology. Water blue stains collagen blue in tissue sections. It is soluble in water and slightly soluble in ethanol. Water blue is also available in mixture with methyl blue, under the names Aniline Blue WS, Aniline blue, China blue, or Soluble blue.
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Patent Blue V, also called Food Blue 5, Sulphan Blue, Acid Blue 3, L-Blau 3, C-Blau 20, Patentblau V, Sky Blue, or C.I. 42051, is a sky blue synthetic triphenylmethane dye used as a food coloring. As a food additive, it has E number E131. It is a sodium or calcium salt of [4-(α-(4-diethylaminophenyl)-5-hydroxy- 2,4-disulfophenylmethylidene)-2,5-cyclohexadien-1-ylidene] diethylammonium hydroxide inner salt.
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Mallory's trichrome stain is a stain utilized in histology to aid in revealing different macromolecules that make up the cell. It uses the three stains: aniline blue, acid fuchsin, and orange G. As a result, this staining technique can reveal collagen, ordinary cytoplasm, and red blood cells. It is helpful, therefore, in examining the collagen of connective tissue. For tissues that are not directly acidic or basic, it can be difficult to use only one stain to reveal the necessary structures of interest.
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Mycobacterium tuberculosis (stained red) in tissue (blue). Acid-fastness is a physical property of certain bacterial and eukaryotic cells, as well as some sub-cellular structures, specifically their resistance to decolorization by acids during laboratory staining procedures. Once stained as part of a sample, these organisms can resist the acid and/or ethanol-based decolorization procedures common in many staining protocols, hence the name acid-fast. The mechanisms of acid-fastness vary by species, although the most well-known example is in the genus Mycobacterium, which includes the species responsible for tuberculosis and leprosy.
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The collapse of the USSR in 1991 resulted in the flooding of the consumer market with imported American and European designer clothing, especially blue jeans. Neon colors such as hot pink, orange, turquoise or electric blue, acid wash denim, rhinestone or sequin dresses, black leather jackets, and geometric printed clothing featuring triangles, zigzags, lozenges and lightning bolts were particularly popular in Yeltsin's Russia during the early to mid 1990s.1990s Russian fashion Skater fashion was particularly popular among teenagers in many former Warsaw Pact countries.Soviet skaters Russian fashion during the 2000s and 2010s generally followed Western trends, with slim fitting grey or navy blue suits being particularly popular among professional men.
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