Azure Blue

Azure Lead, selenium, CuCI2 (and other copper compounds when moistened with HCI) CuBr2 appears azure blue, then is followed by green. 

On the wall directly opposite you, in place of a tapestry, hangs a curtain of cloth-of-gold. Above the curtain, but beneath the window, hangs a chivalric shield. The shield s field is white and its heraldic device is a gold phoenix, issuant from a nest of azure-blue flames. This is the east wall of the hall. Your personal siege is placed on the western arc of the Round Table. 

Cobalt blue [ColAlO lj], also known as cobalt ultramarine or azure blue, is a compound of aluminum oxide and cobalt. It is used as a pigment that mixes well with both oil and water. It also has cosmetic uses for eye shadow and in grease paint. Cobalt blue is one of the most durable blue pigments in that it resists weathering in paints and holds up to other wear and tear. 

Pentachrome Azure Blue B. Crystd from MeOH. 

AZURITE. This mineral is a basic carbonate of copper, crystallizing in the monoclinic system, with the formula Cu2.(C03)2(0H)2, so called from its beautiful azure-blue color. It is a brittle mineral with a conchoidal fracture hardness. 3.5-4 sp gr, 3.773 luster, vitreous, color and streak, blue transparent to translucent Azurite, like malachite, is a secondary mineral, but for less common than malachite. It is formed by the action of carbonated waters on compounds of copper or solutions of copper compounds. 

Some forty years before the discovery7 of ruthenium by Claus, it had been observed by Vauquelin that an azure blue colour is obtained by the action of zinc on certain solutions. This was attributed to the presence of osmium, but is now known to be a characteristic reaction for trivalent ruthenium. A similar colour is obtained by the action of hydrogen sulphide upon ruthenium trichloride, and wTas attributed by Claus and Joly 6 to reduction to the dichloride. This view is supported by Howe,7 who, however, has not succeeded in isolating the salt, but has obtained a derivative to which he gives the formula ... 

Reactions of Salts of Ruthenium.—A delicate and characteristic reaction of ruthenium chloride consists in formation of an azure-blue tint (possibly due to the formation of dichloride) when hydrogen sulphide is passed through its solution in water. 

Ruthenium trichloride solution is reduced by metallic zinc to the dichloride, the colour changing from orange to azure-blue. In the presence of excess of zinc the reduction proceeds even further, metallic ruthenium being deposited as a black powder. ... 

Hydrogen1 sul- Azure-blue eolour Brownish black Brownish black Brownish black Brownish black Brownish black... 

Alkali hydroxides in excess give the solution a green tint and precipitate a little double chloride. On heating the solution a red tint develops, changing to a deep azure blue in consequence of the precipitation of the hydrated dioxide, Ir(OH)4. This serves to distinguish iridium from platinum. 

The pentahydrate forms azure-blue, triclinic crystals, converted by dehydration into the trihydrate, the monohydrate, and the white anhydrous salt.2 The respective densities3 of these forms at ordinary temperature are 2-282, 2-663, 3-289, 3-606, and their transition-temperatures on the absolute scale at 0-1 atm. are 325° C., 339° C., and 401 C.4... 

ALPHAZURINE A.MACID BLUE EG CONG BLEU BRILLIANT FCF 11388 BLUE BRILLIANT BLUE BUCACID AZURE BLUE CALCOCID BLUE EG C.I. 671 C.I. 42090 C.I. ACID BLUE 9, DIAMMONIUM SALT C.I. DIRECT BROWN 78, DIAMMONIUM SALT C.I. FOOD BLUE 2 D C BLUE No. 4 DISULPHINE LAKE BLUE EG EDICOL SUPRA BLUE E6 ERIOGLAUCINE ERIOSKY BLUE FENAZO BLUE XR HIDACID AZURE BLUE H.K. FORMULA No. K. 7117 KITON PURE BLUE L MAPLE BRILLIANT BLUE FCF NEPTUNE BLUE BRA CONCENTRATION... 

Ph4As][CoL(N03)2]. To 0.12 g. (0.17 mmole) of [CoL5][CoL(N03)2] dissolved in 3 ml. acetonitrile, 1.6 ml. of 0.10 M acetonitrile solution of Ph4AsN03 (0.16 mmole) were added with stirring. Addition of ether produced a dark blue solid which was recrystallized from CH2CI2 and ether to give well-formed azure blue crystals. 

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Ruthenium trichloride reduced with a small amount of zinc gives an azure blue color probably due to RuC12 an excess of zinc produces metallic ruthenium as a fine black powder. 

HiS at 80°C Azure blue color RhjSs, brownish PdS, brownish OsS, brownish tr Ss, brownish PtSj, brownish ... 

Mixture with methylene blue, azure II, azure blue II, methylene azure II. Deep-green powder. Sol in water with blue color, less sol in alcohol, slightly sol in chloroform. Inso] in ether. 

Pure natural waters are usually colourless, or azure-blue in thick layers. The blue colour intensity increases with decreasing amount of smaller suspended matter present in water. The presence of finely-divided substances causes a change from blue into green colour. Greenish colour of water is also caused by the presence of calcium salts and the near-green colour of some lakes is due to the shape of the bottom. Yellow to brown colours of surface waters are caused by humic (soil) substances and three-valent iron compounds. 

Azure — Copper chloride. Copper bromide gives azure blue followed by green. Other copper compounds give same coloration when moistened with hydrochloric acid. 

Sulphate of copper, or blue vitriol, forms azure blue crystals, exactly of the same form as those of sulphate of manganese. Its formnla is (puO, S03+H0)+4 aq or (Cu, SO +HOl+daq. With excess of ammonia it forms a deep violet-blue salt, the ammoniuret of copper, in which the water of crystallisation of blue vitriol, or a part of it, appears to be replaced by ammonia. Sulphate of copper is much used as an escharotic in surgery. 

I. Copper turnings are covered with 20% ammonia containing some NH4CI, and air is bubbled through the suspension. An azure-blue solution of [Cu(NH3)J (OH) 3 is formed. Evaporation of the solution in a stream of dry NH 3 yields long, azure-blue needles of [Cu(NH3)4] (0H)3. 

Azure-blue crystalline powder. M.p. (dec.) 220°C d ° 3.88. Insoluble in water. Converts to the green compound in humid air. Soluble in ammonium salt solutions. Crystal structure orthorhombic. 

Fig. 8. Use of FRET to generate new DNA dyes. TO stands for thioazole orange, AB for Azure Blue, F for fluorescein, and ED for ethidium bromide. The dyes bind tightly to DNA such that they are stable even during electrophoresis. Solid lines represent absorption dashed lines, emission. (From Benson el 0/. ")... 

Characters.—Azure-blue coloured powder emits an ammoniacal odour, and has a styptic metallic taste. 

There was a surge of electricity around the hatch. She could sense the main power cables behind the azure blue composite walls, thick lines that burnt with an ember glow of current. There were other cables too, smaller and dimmer. It was one of those which had come alive, connected to a small communications block set into the rim of the hatch. 

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