opalescent - traducción al francés
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opalescent - traducción al francés

OPTICAL IRIDESCENCE PHENOMENA CHARACTERISTIC OF THE OPAL GEMSTONE
Opalescent; Play of color
  • Rough sample of precious opal, showing [[iridescence]]
  • [[Tyndall effect]] in opalescent glass: it appears blue from the side, but orange light shines through.<ref name="Cause of Color Red and Blue">Douma, M., curator. (2008). Blue and Red. In Cause of Color. Retrieved 2005 from http://www.webexhibits.org/causesofcolor/14B.html</ref>

opalescent      
opalescent, resembling an opal, having a milky iridescence
opaline      
n. opaline, opalescent semi-transparent glass
opalescence         
n. opalescence, state of being opalescent, milky iridescence

Definición

Opalescent
·adj Reflecting a milky or pearly light from the interior; having an opaline play of colors.

Wikipedia

Opalescence

Opalescence or play of color is the optical phenomena displayed by the mineraloid gemstone opal, a hydrated silicon dioxide. However, each of the three notable types of opal – precious, common, and fire – display different optical effects; therefore, the intended meaning varies depending on context.

  • The general definition of opalescence is a milky iridescence displayed by an opal, which describes the visual effect of precious opal very well, and opalescence is commonly used in lay terms as a synonym for iridescence.
  • In contrast, common opal does not display an iridescence, but often exhibits a hazy sheen of light from within the stone – the phenomenon that gemologists strictly term as opalescence. This milky sheen displayed by opal is a form of adularescence.
  • Fire opal is a relatively transparent gemstone with a vivid yellow-orange-red color and rarely displays iridescence.

The optical effects seen in various types of opal are a result of refraction (precious and fire) or reflection (common) due to the layering, spacing, and size of the myriad microscopic silicon dioxide spheres and included water (or air) in its physical structure. When the size and spacing of the silica spheres are relatively small, refracted blue-green colors are prevalent; when relatively larger, refracted yellow-orange-red colors are seen; and when larger yet, reflection yields a milky-hazy sheen.

In a physical sense, some cases of opalescence could be related to a type of dichroism seen in highly dispersed systems with little opacity. Due to Rayleigh scattering, a transparent material appears yellowish-red in transmitted white light and blue in the scattered light perpendicular to the transmitted light. The phenomenon illustrated in the bottom photo is an example of the Tyndall effect.

Ejemplos de uso de opalescent
1. Ils sont plusieurs ŕ attendre chaque jour, dans leur habit opalescent, de se découvrir.
2. Apr';s de nombreux essais plus ou moins foireux, nous en restons ŕ un procédé décrit dans le Larousse Ménager des années 30, au plus pr';s d‘obtenir un blanc opalescent et un jaune ti';de et liquide: porter ŕ ébullition 1 l d‘eau salée ŕ 10 g.
3. Stéphane Bonvin, Paris Lundi 5 mars 2007 Dimanche apr';s–midi, la plus jolie portait le numéro 52: «Robe de radzimir et plumes». A ce moment–lŕ, on peut vous assurer que le radzimir avait la couleur d‘un ciel flamand, et que les plumes qui frémissaient de dessous la robe aux grands plis–poufs, hésitaient entre le rose d‘une peau romantique et le mauve opalescent de la timidité. Soit mais... pourquoi pas la silhouette 46: «Top de lapin ciré, jupe de lapin ciré aussi, énorme béret de laine et ceinture de nylon». Tr';s bien, le lapin ciré, pile–poil dans la tendance qui a vu débarquer, en deux semaines de défilés, de Prada ŕ Sophia Kokosalaki, une roulipotée de mati';res inédites, entre plume, fourrure et moquette frisée.