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DENMARK 1957 - 5 ORE - FREDERIK IX - ZINC COIN |
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USA.1943.Lincoln Cent.Zinc-Coated Steel. |
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Tin Element Coin. |
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Lead Element Coin |
ZINC, TIN and LEAD range from grey to white in color and are seldom
used in their pure state as coinage metals. The surfaces of coins struck
in these metals corrode rapidly and take on the appearance of being
covered with a white powder. Being much heavier than the other two
metals,
lead is readily distinguished and possesses a very soft texture.
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Malaysia Silver Proof Planchet. |
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Malaysia 1992 Proof Coins Set Of ^.Obverse. |
SILVER ranges in color from grey to white, depending on the amount and
nature of the base metals to which it is alloyed for coinage. Silver is
generally combined with copper in percentages ranging up to a fineness
up to a fineness of .925 (sterling); when the fineness is less than .500
the resulting metal is known as
Billon. Sulphur in the air causes a
chemical reaction which tones the surface of silver coins, often causing
them to display varying shades of blue, purple and yellow. Extended
exposure of silver coins to open air may cause them to turn almost
black.
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Malaysia.1971.Tunku Gold $100. .917. Obverse. |
GOLD is the most precious of coinage metals, and is
generally used alloyed with copper at a ratio of 9-to-1. Gold is the
heaviest of the traditional coinage metals, and in its refined state may
range in color from a very pale to a very rich yellow. Depending on the
nature of the alloy, the coinage metal can vary in color from a very
pale yellow to a reddish-yellow. Gold in its pure state, and generally
as alloyed for coinage, is not subject to tarnishing or corrosion, and
seldom tones.
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Russian Platinum Coin. |
PLATINUM has occasionally been used for coinage in
the place of gold, it possesses similar weight properties to those of
gold, but has a dull silver-grey color.
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Palladium Element Coin |
PALLADIUM, a member of
the platinum family of metals, has been infrequently utilized for
coinage. It possesses dull silver-grey color qualities similar to those
of platinum.
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Russia 5 Rouble 1992.Brass-Clad-Steel. |
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Russiann Coins.Cupro nickel-clad-copper |
CLAD METALS have been employed in coinage since the
early 1900s, in a number of forms, but their application has widened in
the years since World War II. In most instances examination of the edge
of a clad coin will reveal a base metal in the center to which has been
bonded, by heat and pressure, thin outer layers of a different metal.
Brass-clad-steel coins possess brass colored surfaces and are magnetic,
as are copper-clad-steel coins which have copper colored surfaces, while
nickel or
cupronickel-clad-steel coins bear surfaces characteristic of
the properties of the cladding.
Cupro nickel-clad-copper looks like
cupronickel on the surface,but the edge evidences a copper color, and
nickel-clad-cupronickel coins appear to be cupronickel and are slightly
magnetic.
The traditional coinage metals and their symbolic chemical abbreviations follow:
Platinum - (Pt) Brass -
Gold - (Au) Copper-nickel - (CN)
Silver - (Ag) Lead - (Pb)
Billon - Stell -
Nickel - (Ni) Tin - (Sn)
Zinc - (Zn) Aluminum - (Al)
Bronze) - (Ae) or (Cu) Cupro-nickel) -
Copper) - (Ae) or (Cu) Clad Copper) -
Glad to see my favourite metal is in here.
ReplyDeleteWill we see BNM mint a platinum coin this year? Hahahaha.... that will be a rare one.
Hi Malaysia Coin,
ReplyDeleteMe too! I hope they will be more versatile to take up your challenge to mint a 'Platinum' metal coin!Sooner,'Platinum' may end up to be another rare earth metals!Lagi no chance!Haha!