An alloy of copper and lead. It is frequently employed on casting, due to its low melting point. General Name, Symbol, Number copper, Cu, 29 Chemical series transition metals Group, Period, Block 11, 4, d Appearance metallic brown Atomic mass 63. ... General Name, Symbol, Number lead, Pb, 82 Chemical series poor metals Group, Period, Block 14, 6, p Appearance bluish white Atomic mass 207. ... One half of a bronze mold for casting a socketed spear head dated to the period 1400-1000 BC. This article is about the manufacturing process. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ...
This is used either directly or after it has been toned, or ornamented, or made a background for a figure subject by painting the same upon it with vitrifiable pigments, fused to its surface or incorporated with its substance by the means of heat.
In many cases where china and metal are now employed the ancients used glass: they blew, cast, and cut into it thousands of objects with which they furnished tombs and temples, palaces and private houses; and adorned their persons, their garments, and their buildings.
The new process, which revolutionized the art, consisted in painting with metallic pigments which could be fused into the glass, the painting being thus made as lasting as the glass itself.
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