Scarlet Crystal

Tellurium 3-ethylacetylacetone di-iodide, (C5H502.C2H5) Tel2, crystallises from ethyl alcohol as light scarlet crystals. In powdered form and in alcoholic solution it is orange in colour. It gives no coloration with aquo-alcoholic ferric chloride. It sinters and blackens at 149° C., and decomposes with intumescence at 176° C. 

Chromic Anhydride (Cr03).—1-5 vols. of cone, sulphuric acid are added gradually, and with shaking, to 1 vol. of a saturated solution of potassium chromate. The mixture is allowed to cool, when the anhydride separates out as scarlet crystals. The crystals are filtered off, washed with a little nitric acid, and dried in a desiccator. The crystals are hygroscopic, and should be preserved in a well-stoppered bottle. 

It may also be noted that liquid phosphorus prepared by melting in sealed tubes under high pressures may deposit scarlet crystals. 

C5H5)2Cr Scarlet crystals 173 2 Very air sensitive soluble in HQ giving CsHg and blue cation, probably [Tj5-CsHsCrCl(H20) ]+... 

Sodium - 6 - hydroxymercuri - 2 - nitrophenolate gives scarlet crystals the 4-compomrd is deeper red. ... 

WOCI4 forms scarlet crystals and a red monomeric vapor and is in general highly reactive. It is violently hydrolyzed by water. W02C12 occurs as yellow crystals and is not nearly so reactive as WOCl4 it is hydrolyzed only slowly by cold water. 

Finally, 4-amino-2,3-dimethyl-5-cyanoformimidoylimidazole (191), when set aside at 25°C in acetic anhydride, gave an excellent yield of 6-cyano-2,9-dimethylpurine (192), whereas with acetone at 25°C, scarlet crystals of 2,2,8,9,-tetramethyl-l,2-dihydropurine-6-carboxamide (193) were obtained in excellent yield. Because 193 was the first red-colored purine to be discovered, the constitution was confirmed by X-ray crystallography.364... 

Dissolve naphthalene in a little spirit, and add an equal quantity of a solution of picric acid in spirit. On cooling, yellow needles of naphthalene picrate separate, C,oHg.CQH20H(NO,)3. Benzene forms colourless crystals, anthracene, scarlet needles, having a similar composition. Sec Appendix, p. 295. 

The Hall of Great Bliss contains an altar of jet. The walls and floor are of darkest indigo, supporting a faceted crystal dome that refracts the white brilliance from the White Sun over the battlements. There are three pillars, two black and one of scarlet marble. The eastern throne is of purest alabaster. The tarot tapestries which hang in the chamber are those of Keys I, III, VI and VII. 

The union of mercury and sulfur is effected in the most simple way of all by merely rubbing the two substances together. The product is a black, amorphous compound, quite unlike the bright scarlet crystalline mineral cinnabar. To convert it into the crystalline form, advantage is taken of the following principle An amorphous form is more unstable than a crystalline form and tends to go over into it. The unstable amorphous form is also more soluble in solvents than the stable crystalline form. If, therefore, a solvent can be found in which both are slightly soluble, the amorphous form dissolves to saturation, but this produces a solution oversaturated with respect to the stable form, and some of this crystallizes out. More of the unstable... 

Ammonium nitrate exists in four different forms, all of which are enantiotropic the change of white phosphorus into the red (or violet) variety is monotropic. Mercuric iodide exhibits a striking example of an enantiotropic transition. Above 126.3°, it is obtained in yellow rhombic crystals while below that temperature, a scarlet tetragonal modification appears. 

PROUSTITE. This ruby-silver mineral crystallizes in the hexagonal system its name is a product of its scarlet-to-vermilion color when first mined It is a silver arsenic sulfide. AgjAsS, of adamantine luster Hardness of 2-2,5 specific gravity of 5.55-5.64. Usual crystal habit is prismatic to rhombohedral more commonly occurs massive. Conchoidal to uneven fracture transparent to translucent color, scarlet to vermilion red. Light sensitive must be kept in dark environment to maintain its primary character. A product of low-tcmpcraturc formation in most silver deposits. Notable world occurrences include the Czech Republic and Slovakia, Saxony, Chile and Mexico. Found in minor quantities in the United States the most exceptional occurrence at the Poorman Mine, Silver City District. Idaho where a crystalline mass of some 500 pounds (227 kilograms) was recovered m 1865, It was named for the famous French chemist, Louis Joseph Proust. 

Crystal violet, methyl violet, brilliant violet, ethyl purple, h benzyl violet, Hofmann s violet, chrome violet Rosolc red, resole scarlet Janus red, diazine red w < 3 [Pg.427]

Palatine scarlet, xylidine ponceau. Victoria scarlet, lanafuchswe, sorbine red. Biebnch acid red. crystal scarlet fast red. croeaine scarlet, Biebnch scarlet, wool and cloth h reds, wool scarlet, acetyl red, amido naphthol red, enocarmme, enorubine, azo acid ° red. Guinea fast red, fast acid cochineal, etc S o to ff 8. Decolorised 1 Colour is not restored either by air or by persulphate Axo Class Boil with dihitc bichromate Ks j f If 18 p P srs >< 1 s > j-... 

Bismuth may be used in place of lead, but it dissolves only one-fifth as much phosphorus, and the crystals obtained are less pure. The metals appear to be held in solid soln. Only very minute quantities of Hittorf s phosphorus are obtained by sublimation. According to L. Troost and P. Hautefeuille, the same variety is formed when red phosphorus is heated under press, to 580°. The work of A. Pedler, J. W. Retgers, and D. L. Chapman shows that this variety differs from ordinary red phosphorus only in the size and development of the crystals. Fine-grained red phosphorus is scarlet phosphorus, while coarse-grained red phosphorus is metallic or violet phosphorus. A number of other allotropes have been reported, but many of them are the result of a misinterpretation of facts, or of an incomplete knowledge of facts. 

Gold monosulphate, AuS04.—Evaporation of a solution in concentrated sulphuric acid at 250° C. of the so-called add auryl sulphate, AuOHS04 (p. 847), yields large crystals of the monosulphate.10 It is characterized by its scarlet-red colour. Exposure to moist air changes it into the black hydrated monoxide. 

Auric bromide, AuBr3.—The bromide is formed in aqueous solution by the action of water on gold dibromide.14 It can be obtained in the solid state from the same source by the action of moist ether, the aurous bromide formed remaining undissolved, and auric bromide being left on evaporation of the dried ether solution. It is also produced by the interaction of aqueous bromine and gold,16 as well as by the action of solutions of such perbromides as cobalt tribromide, manganese tetrabromide, and ferric bromide on the metal.16 The aqueous solution and the crystals deposited from it have a scarlet-red colour, but the pure salt contained from solution in ether is a dark-brown... 

ATUL ACID CRYSTAL ORANGE G see HGCOOO ATUL ACID SCARLET 3R see FMU080 ATUL CONGO RED see SGQ500 ATUL CRYSTAL RED F see HJF500 ATUL DIRECT BLACK E see AQPOOO... 

The air-dried product is crystallized by dissolving it in chloroform, (approximately 120 ml.), followed by dilution of the filtered boiling liquid (Note 10) with hot petroleum ether (boiling range 60-80°, 60-80 ml.). The crystalline product, which separates rapidly, is collected at 0°, rinsed on the filter with a mixture of chloroform and petroleum ether (1 .3), and dried. The yield of magnificent deep-scarlet lustrous prisms, m.p. 127-128°, varies between 28.9 and 30.4 g. (54-57% of the theoretical). Concentration of the combined filtrates and wash liquids under reduced pressure to a small volmne (50-80 ml.) yields an additional small quantity (1.5-3.0 g., 3-6%) of material of satisfactory purity, m.p. 121-124°. 

An adsorption test for dye was performed using model solution, which was prepared with acid red 44 (crystal scarlet, Aldrich). Prepared aluminas (P2 and P4) were added into 2% polydiallyldimethylanunonium chloride (PDDA, Aldrich) solution, and stirred for 3 hr. 0.1 g of PDDA treated aluminas were stirred with 10 ml of dye solution (50 ppm). Depletion of dye was determined by UV (510 run) spectrometry (HP8453, Hewlett Packard). 

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