This is smelted with rich gold ores, notably those containing tellurium, for white metal or regulus; and by a following process of partial reduction analogous to that of selecting in copper smelting, " bottoms " of impure copper are obtained in which practically all the gold is concentrated.
It is a silvery white metal which burns on heating in air.
Pure potassium is a silvery white metal tinged with blue; but on exposure to air it at once forms a film of oxide, and on prolonged exposure deliquesces into a solution of hydrate and carbonate.
Magnesium is a silvery white metal possessing a high lustre.
Aluminium is a white metal with a characteristic tint which most nearly resembles that of tin; when impure, or after pro longed exposure to air, it has a slight violet shade.
The United Provinces have, among other specialties, an elegant black ware with designs in white metal worked into its surface.
It is a silvery white metal which melts at 38.5° C. and has a specific gravity of I 52.
The coarse-metal is now smelted, with coke and siliceous fluxes (in order to slag off the iron), and the product, consisting of an impure copper sulphide, is variously known as " blue-metal," when more or less iron is still present, " pimplemetal," when free copper and more or less copper oxide is present, or " fine " or " white-metal," which is a fairly pure copper sulphide, containing about 75% of the metal.
The " English process " is made up of the following operations: (i) calcination; (2) smelting in reverberatory furnaces to form the matte; (3) roasting the matte; and (4) subsequent smelting in reverberatory furnaces to fineor white-metal; (5) treating the fine-metal in reverberatory furnaces to coarseor blistercopper, either with or without previous calcination; (6) refining of the coarse-copper.
The first blow occupies about 25 minutes, and oxidizes all but a small quantity of the iron and some of the sulphur, raising the product to white metal.
Nicholls and James have applied, very ingeniously, well-known reactions to the refining of copper, raised to the grade of white metal.
A portion of the white metal is calcined to such a degree of oxidation that when fused with the unroasted portion, the reaction between the oxygen in the roasted matte and the sulphur in the raw VII.
It is a white metal of bluish tint and is malleable and ductile.
The white metal is then machined to the correct radius using the big borer.
Various 25mm figures & white metal VW have been added Invaders diorama.
Most of these bayonets made during and after 1916 had brass hilts in place of the earlier white metal type.
It is a silvery white metal which melts at 38.5Ã‚° C. and has a specific gravity of I 52.
Kirsch's basic hardware consists of the white metal type curtain rods that are functional without drawing too much attention to themselves.
Titanium is a greyish white metal that is often selected for jewelry because of its durability, look, and hypoallergenic qualities.
While this may initially seem inadvisable, using white metal helps lighten the stone and the differences are usually not noticeable.
Choose a white metal such as white gold or platinum that will not contrast as harshly with the stone's edges, blurring where the stone and setting meet.
The sharp corners of the princess diamond shape are comparable to the sharpness of platinum's color, and the bright white metal offers a startling contrast to the deeply sparkling facets of a princess cut.
Palladium - This bright white metal is gaining in popularity.
Yellow gold has warm tones, whereas white metal reflects the black and white color theme.
Platinum is a beautiful, naturally white metal that is between 90 and 95 percent pure.
The cool white metal is also a fantastic backdrop to gemstones making this a good choice for people looking for a promise ring set with gemstones.
The cool white metal sets off even the palest of gemstones in style.
Platinum is a beautiful, shiny silver white metal much rarer than gold.
The warm yellow of the gold makes a striking contrast with the cool white metal of the stainless steel.
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