Pearly luster

Wa.llpa.per and Coated Paper. The shiny particles of mica give a silky or pearly luster when appHed to paper. The effect is pleasing to the eye, and in some cases simulates fabric. 

When oil from the head of the sperm whale is cooled, spermaceti, a translucent wax with a white, pearly luster, crystallizes from the mixture. Spermaceti, which makes up 11% of whale oil, is composed mainly of the wax cetyl pabnitate ... 

This recipe is rendered obscure by the use of the term quicksilver in an unusual sense. As suggested by Lipp-mann, it cannot be mercury, but was probably some finely divided substance of pearly or silvery character, calculated to give the pearly luster. 

The word crystal often meant with the ancients quartz crystal, but it is very evident that with the authors of these notes the term was used in a more comprehensive sense to include other transparent or translucent stones. This use is very evident in the many recipes for imitation of precious stones, where the processes involve a degree of porosity or absorbent power towards colored solutions not possessed either by quartz crystal or by glass, while certain agates, micas, alabasters or other stones possess this property. In case of the above recipe, it is doubtful whether any such mordanting would in a reasonable time roughen the surface of real quartz crystal adequately. The quicksilver here mentioned is evidently the same substance of pearly luster previously referred to. 

PERLITE (or Pearlstone). An unusual form of siliceous lava composed of small spherules of about the size of bird shot or peas. It is grayish in color with a soft pearly luster. The spherules often show a concentric structure and are believed to be funned as a result of a peculiar spherical cracking developed while cooling. They may be confused with oolites, which are classified as concretions. 

Cetyl esters wax occurs as white to off-white, somewhat translucent flakes (typically in the range of 5 pm to several millimeters in the largest dimension), having a crystalline structure and a pearly luster when caked. It has a faint, aromatic odor and a bland, mild taste. 

Properties Pink and lilac to gray color pearly luster perfect micaceous cleavage. Mohs hardness 2.5-4, d 2.8-3.0. 

Properties Light-pink, rose-red, brownish-red, or brown mineral white streak vitreous to pearly luster photoluminescent. Found in veins with ores of silver, lead, copper manganese. D 3.3-3.6, Mohs hardness 3-4. 

Properties A vanadium-bearing species of mica. Formula variable with V203 up to 28%. Occurs as minute scales with micaceous cleavage, dark green to brown in color, pearly luster, Mohs hardness 2.5, d 3.0. 

Properties Gray, yellow, brown, green, white, or brownish-red mineral vitreous inclining to pearly luster white streak. D 3.83-3.88, Mohs hardness 3.5—4. 

Properties White to brown, red, gray, yellow solid vitreous to pearly luster. Mohs hardness 4.5-5, d 2.8-2.9. 

Properties White, monoclinic, crystalline plates pearly luster faint acetous odor astringent taste. D 1.735, loses 2H20 at 100C, mp 200C (decomposes). Soluble in water and alcohol. 

Pearly luster concentrate with Newtonian viscosity... 

White, somewhat translucent, slightly unctuous masses with crystalline fracture and pearly luster, almost odorless and tasteless but becomes yellow and rancid on long exposure to air- d 0.938-0.944 mp 42-5CT rtg1 about 1.4330. Sapon no. 120-136. Iodine no. 3-4.4. Insol in water or cold alcohol. Sol in chloroform, ether, carbon disulfide, oils, boiling alcohol slightly sol in petr ether. 

Talc is one of the softest minerals known. It has a numerical rank of l on the Mohs scale of minerals. The Mohs scale ranks minerals from the softest (1 = talc) to the hardest (10 = diamond). Talc is so soft that it can he scratched with the fingernail. The mineral has a pearly luster and may come in a variety of colors, ranging from white gray, or silver to black, brown, pink, or green. Color variations depend on impurities in the mineral. 

UncompatibUized blends of PP with 3-30 wt.% of either polystyrene (PS) or high-impact-PS (HIPS) were developed in 1971 for soda-straw tubes with pearly luster. Later, for improved mechanical performance, these blends were compatibilized by addition of either a tri-block styrene-butadiene-styrene copol)uner (SBS), a multiblock (SB) copol)uner. Addition of hydrogenated-SBS, i.e. styrene-ethylene/butylene-styrene block copolymer (SEBS) was found to improve impact and flexural strength, whereas incorporation of a linear three-block copolymer S1-D-S2 (where SI s S2 are PS-blocks and D = polydiene block) gave PP alloys with good crack and impact stress resistance [4]. 

Figure 7-1 illustrates the various optical principles of conventional pigments (absorption pigments), metal effect pigments, and pearls and pear] luster pigments. In the case of absorption pigments, the interaction with light is based upon absorp-... 

The simultaneous reflection of light from many parallel layers produces the characteristic pearly luster, the hril-liance of which depends on the uniformity and parallelism of the crystals. Natural pearlescent pigments are composed primarily of guanine crystals derived from fish scales. They are expensive but nontoxic. The synthetic pearlescents are based on crystallized lead or bismuth compounds or platelets of mica coated with a dye or pigment. (Bailey s industrial oil and fat products. Shahidi F, Bailey AE (eds). Wiley, New York, 2005)... 

Portlandite is a calciiun hydroxide mineral with composition Ca(OH)2- It occurs as relatively soft, white, platy, hexagonal crystals and compact masses that have a pearly luster. It was first described by Tilley in 1934 and is named after its occurrence in Portland cement. It is a common component of man-made lime mortars and plasters (for example, see Moropoulou et al., 1995), but occurs naturally in Kalahari (South Africa), Buskerud (Norway), Bavaria (Germany) and Vesuvius (Italy), forming particularly by fumarole deposition or by the decomposition of feldspar group minerals in kaolin (qq.v.) samples, as described by Peng et al. (1995). 

Feldspars exhibit uneven fracture, and have a vitreous to pearly luster. Colors are generally white, cream and pink, hut also milky, clear, huff, hrown, red, gray, green and hluish. Property ranges for the major types of feldspar are sp. gr. 2.56—2.63 m.p. 1110-1532°C refiactive index 1.524—1.584. 

Nacreous (pearlescent) pigments are thin transparent platelets of high refractive index which partially transmit and partially reflect light. The pearlescent effect is due to specular reflection from the broad surfaces of the transparent platelets, and the parallel orientation of those platelets at various depths within the binder film. Light transmitted through platelets near the film surface is partially reflected by deeper platelets. The dependence of reflection on viewing angle and the sense of depth created by reflection from many layers produces the pearly luster. 

Uses Detergent, cosmetic, emulsion and personal care prods, with pearly luster Properties Fluid 35% cone,... 

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