WHAT IS THE BRASS ?

BRASS: General name for alloys of copper with zinc or tin, with the proportions about 70–90% copper and 10–30% of the other base metal. It is possible that due to difficulties in introducing the zinc ore calamine into the melt, brass appeared later in use than bronze (copper and tin) and other copper alloys. Mosaic gold, pinchbeck, and prince’s metal are varieties of brass differing in the proportions of the ingredients. Corinthian brass is an alloy of gold, silver, and copper.

WHAT IS THE ANNEALING ?

ANNEALING: the treating of a metal or alloy with heat and then cold – or the repeated process of heating and hammering to produce the desired shape. After casting metal, it may be necessary to further process it by cold working, hammering, and drawing the metal – either to produce hard cutting edges or to produce beaten sheet metal. Hammering makes the metal harder, though more brittle and subject to cracking, because it destroys its crystalline structure. Annealing, the reheating of the metal gently to a dull red heat and allowing it to cool, produces a new crystalline structure which can be hammered again. The process may be repeated as often as is necessary. The final edge on a weapon may be left unannealed as it will be harder and last longer.

WHAT IS THE ALLOY ?

ALLOY: any of a number of substances which are a mixture of two or more metals, such as bronze (copper and tin), brass (copper and zinc), or tumbaga (copper and gold). An alloy has properties superior to those of the individual metals. They are not simple mixtures, but complex crystalline structures that may differ considerably from any of their constituents. Slight alterations of the proportions of the metals can bring significant changes in the properties of the alloy. Alloys containing only two major metals are known as binary alloys and those with three as ternary alloys. Gold is alloyed with various metals; when mixed with mercury it is called an amalgam, and with silver, it is called native gold. Bronze was the most important alloy in antiquity. The term is also used to describe the technique of mixing the metals.