Gold
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From Websters dictionary -

Gold noun 1. A precious yellow metallic element, highly malleable and ductile, and
not subject to oxidation or corrosion.  
Symbol Au; Atomic Weight of 196.967;
Atomic Number 79; Specific Gravity of 19.3 at 20 C...

The following is from Alfred M. Weisberg in Gold Plating Technology -
Electrochemical Publications Limited.

Why Use Gold?

Gold is electroplated not only for its psychological effects, but because of its
unique combination of physical properties.  Mythology, folk tales, the Bible, and
other written and oral records from all ages attest to gold's influence on the
human animal.  It has inspired greed, covetousness and ostentation.  It has been
the instigator of war, rape, and murder.  At the same time, it symbolically
represents the sun, life, eternity, solidity, ultimate value, and love.  Although
many countries have restrictions on the ownership of gold, it pervades our minds
and lives.  Gold is mentioned over 400 times in the Bible and nearly 300 times by
both Shakespeare and Tennyson.  It is a family name in many countries of both
the east and the west.  It's effect on many was recognized by by Chilon in 560 BC,
"Gold is tried by a touchstone and man by gold."

It is impossible to describe what makes humans respond to the warmth and
beauty of this yellow metal, but they do in virtually every country in the world.  In
every age, people have desired to possess gold in the form of ornaments as well as
bullion, but the high and increasing cost restricts private ownership of solid gold
even when it legally permitted.  However, electroplating allows a small amount of
the metal to be thinly and evenly distributed over a very large surface area so that
it may simulate bulk gold and as such be used to decorate a variety of less
expensive consumer items.

Jewelery, trinkets, and other novelties may be electroplated with as little as
0.025 microns (0.000001") of gold and heavier deposits of 1.75 microns (0.000070")
and 2.5 microns (0.000100") can be controlled to within 0.025 microns (0.000001").  
Such coatings over nickel are widely used as decorative finishes on functional
objects such as buttons, buckles, metal picture frames, etc. etc.

In the technical field gold is also electroplated in order to make use of its
excellent characteristics in terms primarily of
electrical, chemical, and optical
properties.