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Coins are exposed to all sorts of things that react with their metal(s) - oxygen in the air, acids and oils from skin, etc. etc. These produce chemical changes that alter the coins' colour. For example copper turns brown from exposure to the air (oxidation) and can even develop a green surface when in long-term contact with moisture.
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Why is the penny a different color then the rest of the coins?
because its copper?
How can you tell silver from pewter coins?
look at the edge if it is a silver coin it will be a gold slver color otherwhies it will have silver and copper color
What color will aniline turn litmus paper?
Aneline is basic,so litmus color is changed into blue
What hapens when you mix pigment colors?
The reflected color is changed.
What happens after dipping a substance into a pH solution?
The color of the pH solution can be changed.
Why do older coins weigh more than younger coins?
Older coins were made of different metals, such as silver or copper. Coins that used to be silver are now nickel or nickel-coated copper, and coins that were copper are now copper-coated steel or zinc.
Can coins in FarmVille be changed to dollars?
No, however you can buy farmville coins for cash.
How many coins can be changed for a 50p coin?
You could get 50 one pence coins.
Why do Yorkshire terriers change color as they get older?
Same reason humans' hair changes color when they get older.
How could someone learn the value of older American gold coins?
Older American gold coins are a great asset to hold. Quantitative Easing may be diminishing the value of the dollar, but gold retains its value. The Coins section of the About website gives indications of values of old gold coins.
What us coins are not silver?
No current circulating US coins contain any silver at all. For information about older coins, please see the Related Question.
Does the color change when water evaporates?
The color is not changed.
Do tortoises change shell color when they get older?
yes. as wild desert tortoises get older the color of its shell gets lighter color if dark when young.
What are the current Australian coins of 2009?
Australian coins have not changed since last year. General circulation coins are - 5, 10, 20 and 50 cents, and $1 and $2 coins.
How many 5p coins can be changed for a 50p coin?
10, obviously.
What is sold on the website 'Golden Eagle Coins'?
There are many coins that are sold on the website Golden Eagle Coins for it's customers. The website focuses mainly on older coins that are silver and gold and even purchases both.
What changed color in 1924?
Ford cars changed basic colours
