Lustre

Brand Name(s) Alphaquin HP, Alustra, Claripel, Eldopaque, Eldopaque Forte, El-doquin, EpiQuin Micro, Esoterica Regular, Glyquin, Lustra, Lustra-AF, Melanex, Mel-paque HP, Melquin-3, Melquin HP, Neostrata AHA, Neostrata HQ, Nuquin-HP, Palmer s Skin Success Fade Cream, Solaquin, Solaquin Forte... 

Cream 2% (Eldopaque, Esoterica Regular, Palmer s Skin Success Fade Cream), 4% (Alphaquin HP, Alustra, EpiQuin Micro, Lustra, Melquin HP, Nuquin HP). 

Cream, with sunscreen 2% (Solaquin), 4% (Claripel, Glyquin, Solaquin, Solaquin Forte, Lustra-AF, Melpaque HP). 

This same oxide exists in a variety of other forms, such os a fibrous mass, with the fibres radiating from a centre, in which state it is termed the red hematite or fibrous iron ore. When the ore is an amorphous mass, it is termed compact iron, ore when mixed with clay and other earthy matters, red ochre when hard, and combined with silica, jaspery ore / whon in scales of a black metallic lustra, it is known as micaceous iron ore or iron glance. 

When cast-iron is fractured, it exhibits a grey color, sometimes approaching to dull-white, and, in other cases, to dark-grey, with spots nearly black. The lustra is sometimes motallic, resembling froshly-cut particles of lead lying on the surface and, in. other cases, there seems to ha crystals in the Iron disposed in rays. 

Most acid halide reactions occur by a nucleophilic acyl substitution mechanism. As shown in Figure 21.6, the halogen can be replaced by -OH to yield an acid, by -OR to yield an ester, or by -NH2 to yield an amide. In addition, the reduction of an acid halide yields a primary alcohol, and reaction with a Grignard reagent yields a tertiary alcohol. Although the reactions we ll be discus-sing in this section are jl lustra ted only for acid chlorides, they also occur with other acid halides. 

Lustra-Pearl . [Van Dyk] Mica, titanium dioxide pearlescent pigments for cosmetics, makeup. 

Preparation. — By fusing amorphous silicon with aluminium, and boiling the compound in hydrochloric or hydrofluoric acid, which dissolves the aluminium, leaving the silicon in the form of hexagonal plates with a metallic lustra. 

Z Amour est un mot par trop galvaude depuis nombre de lustres - lustre could refer to lustra , periods of five years, or to glimmers of brilliance. I assumed the former meaning - PV. 

A. Lopez, B. W. Brooks, lustra. Chem. Engrs Research Event, Nottingham, 1997, pp. 1225-1228. 

When a solution of, say, 1 g. of hydroquinone in 4 ml. of rectified spirit is poured into a solution of 1 g. of quinone in 30 ml. of water, qulnhydrone C,HA.C,H (0H)3, a complex of equimolecular amounts of the two components, is formed as dark green crystals having a gfistening metallic lustre, m.p. 172°. In solution, it is largely dissociated into quinone and hydroquinone. Quinhydrone is more conveniently prepared by the partial oxidation of hydroquinone with a solution of iron alum. 

On a fresh surface the metal has a steely lustre but rapidly tarnishes in air as a result of surface formation of oxide and carbonate species. For protection against oxidation the metal is usually stored in a light mineral oil. When made finely divided, eg, on being cut, it can be strongly pyrophoric, and, for this reason is used, as the ferro-alloy mischmetal, in lighter flints and ordnance. Cerium reacts steadily with water, readily dissolves in mineral acids, and is also attacked by alkafl it reacts with most nonmetals on heating. 

Alternatively dissolve the salt (30g) in glacial acetic acid (200mL) by heating and filter. If crystals do not appear, the glass container should be rubbed with a glass rod to induce crystn which occurs within Ih. If not, allow to stand for a few days. Filter the cinnamon brown crystals which have a sliky lustre and dry over CaO. Keep away from moisture as it is decomposed by cold H2O. [Lux in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Vol II, p 1469 1963 Williams and Hunter Can J Chem 54 3830 1976.]... 

Nickel (II) phthalocyanine [14055-02-8] M 571,3, m >300 , Wash well with H2O and boiling EtOH and sublime at high vacuum in a slight stream of C02. A special apparatus is used (see reference) with the phthallocyanine being heated to red heat. The sublimate is made of needles with an extremely bright red lustre. The powder is dull greenish blue in colour. [J Chem Soc 1719 7936.]... 

Antimony is a bluish white metal with good lustre but poor heat conducting ability. It is stable in air and resistant to dilute acids but attacked by halogens, sulphur, phosphorus and arsenic. 

Benzidine.—Five grams of powdered hydrazobenzene are shaken with 125 c.c. hydiochloric acid (jpei cent.) at 20—30. In a quarter to half an hour the substance will have completely dissolved. Finally, the mi.xtuie is heated to 45—50, a little water added to ledissolve any benzidine hydrochloride, and filtered warm. The benzidine is precipitated from the solution of the hydrochloride by adding to the cold solution an e.xcess of caustic soda solution. It is filtered and washed free from alkali, and lecrystallised from boiling water or dilute alcohol. It crystallises m plates with nacreous lustre, m. p. 127°. 

Si-Si bond energy. The element is a semiconductor with a distinct shiny, blue-grey metallic lustre the resistivity decreases with increase of temperature, as expected for a semiconductor. The actual value of the resistivity depends markedly on purity but is 40ohmcm at 25° for very pure material. 

The most extensive group of nitrides are the metallic nitrides of general formulae MN, M2N, and M4N in which N atoms occupy some or all of the interstices in cubic or hep metal lattices (examples are in Table 11.1, p. 413). These compounds are usually opaque, very hard, chemically inert, refractory materials with metallic lustre and conductivity and sometimes having variable composition. Similarities with borides (p. 145) and carbides (p. 297) are notable. Typical mps (°C) are ... 

Some of the alkali metal-group 15 element systems give compounds of stoichiometry ME. Of these, LiBi and NaBi have typical alloy stmc-tures and are superconductors below 2.47 K and 2.22 K respectively. Others, like LiAs, NaSb and KSb, have parallel infinite spirals of As or Sb atoms, and it is tempting to formulate them as M+ (E )" in which the (E )" spirals are iso-electronic with those of covalently catenated Se and Te (p. 752) however, their metallic lustre and electrical conductivity indicate at least some metallic bonding. Within the spiral chains As-As is 246 pm (cf. 252 pm in the element) and Sb-Sb is 285 pm (cf. 291 pm in the element). 

The sulfides have been less thoroughly examined than the oxides but it is clear that a number of stable phases can be produced and nonstoichiometry is again prevalent (p. 679). The most important are the disulfides, which are semiconductors with metallic lustre. TiS2 and ZrS2 have the Cdl2 structure (p. 1211) in which the cations occupy the octahedral sites between alternate layers of hep anions. 

As for the previous oxidation state, the chemistries of Mo" and W" are much more extensive than that of Cr" whieh is largely confined to peroxo- and fiuoro- complexes. [Cr(02)2(NH3)3], which has a dark red-brown metallic lustre, may be obtained either by treating [Cr(02)4] " with warm aqueous ammonia or by the action of H2O2 on ammoniacal solutions of (NH4)2Cr04. It has a pentagonal bipyramidal structure in which the peroxo- groups oeeupy... 

The isomorphous diiodides of Ce, Pr and Gd stand apart from all the other, salt-like, dihalides. These three, like LaH, are notable for their metallic lustre and very high conductivities and are best formulated as (Ln ,2I",e", the electron being in a delocalized conduction band. Besides the dihalides, other reduced species have been obtained such as LnsCln (Ln = Sm, Gd, Ho). They have fluorite-related structures (p. 118) in which the anionic sublattice is partially rearranged to accommodate additional anions. 

From the residue remaining after distillation v obtained a substance ciystalllsing in colourless, odourless lar pearly lustre, and hating an appaieully constaut melting-point of ti. 5 C. Fbe behaviour of this substance towards reagents proved quite con-clnsively that it is a paraffin, aod most probably triacontane... 

Electropolishing which exploits a generally similar type of solution, but introduces anodic currents as an additional means of dissolution thereby providing better control of rapid processing. Electrosmoothing and electrobrightening are terms used to describe inferior finishes which may have lustre but have lower specular reflectivity. 

A thickness of at least 0-8 xm is normally needed to ensure that the required crack pattern is formed all over a shaped part. Such microcracked chromium coatings have a slightly lower lustre than the thinner conventional chromium deposits and take longer to deposit. The improved resistance to... 

Fogging reduction of the lustre of a metal by a film or particulate layer of corrosion product, e.g. the dulling of bright nickel surfaces. 

Pyrazine-2,3-dicarbonitrile (2 g, 17.5 mmol) was heated with CuCl (1 g, 10 mmol). A blue color developed at 130 C, the internal temperature rose rapidly to ca. 250 C, and HC1 was evolved. The powdered product was washed with NH4OH, H20 and EtOH, and was dissolved in coned H2S04. The deep-blue solution was filtered and a blue solid with a purple lustre was precipitated with ice yield 1.50 g (66%). 

All A2MH4 contain square planar MH4- units, but at high temperatures the A2MH4 salts adopt the K2PtCl6 structure with hydrogens able to move between different square planar orientations. M2PdH2 (M = Li, Na) compounds have metallic lustre and display metallic conductivity [40]. 

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