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Tarnished coins undergo a chemical reaction with substances like sulfur and oxygen in the air, creating a layer of tarnish on the surface. This tarnish is a form of corrosion that can dull and discolor the coin. To clean tarnished coins, methods such as using a mild soap and water solution, rubbing with a cloth, or using specific coin cleaning products can be effective in restoring their appearance.
What else can I help you with?
When a substance changes from one physical form to another you say the substance has had a what?
When a substance changes from one physical form to another, you say the substance has had a phase change or undergone a phase transition.
What causes silver coins to tarnish?
Silver coins tarnish when they react with sulfur compounds in the air, forming a layer of silver sulfide on the surface. This reaction occurs over time and exposure to air, causing the coin to develop a dark, tarnished appearance.
How do you clean silver dollars?
The answer is you don't clean your coins. Cleaning coins is detrimental to the value. Unless they are caked in dirt don't clean them, if they are caked in dirt, clean with soapy water and a towel or sponge and dry.
Why do copper coins go dull?
because the old copper coins are made of pure copper but they had to make them out of different matierials because the copper the coin was made of was worth more than the coin itself, therefore people were melting down copper coins and selling the copper. the new coins are now made of a small percent of copper and more iron.
How does the reaction between vinegar and copper affect the appearance of the copper surface?
When vinegar reacts with copper, it forms copper acetate, which can give the copper surface a greenish-blue color known as patina. This patina changes the appearance of the copper surface by creating a tarnished or aged look.
What are uncapsulated coins?
Encapsulated coins have been placed in small plastic containers to keep them from getting tarnished.
Is your coin worth more tarnished?
Most collectors want unpolished/uncleaned coins.
What are some examples of physical changes for a tarnished penny?
Scratching it
What are the changes undergone for clay pot?
hgj
What changes has the Cleveland Indians hat undergone?
The changes that the Cleveland Indians hat have undergone, is the color of the Indian. Every time they would always change the color of the hat, by lightning the blue.
What is the best way to clean tarnished and dirty coins?
put in a glass of cheap coca cola and leave over night
Are new Indian coins still the same size as pre-1947 British Raj coins?
No, India has undergone several major changes in their coinage. Inded, some denominations used during the British rule of India no longer exist such as the Anna. The coins used in India today aren't the same size or composition as those used during British rule.
What chemical changes the protective ozone layer?
Ozone layer has undergone various changes. These are the depletion of ozone molecules.
Why might not wrestling be considered among be oldest sports in recorded history?
Wrestling has undergone many changes since it’s original conception
Have US coins always had the same value as they do now?
No, for silver coins as the value of silver changes the value of the coin changes. The same is true for gold coins.
Has the sport curling undergone any major changes since its original inception?
No. :P
Why might not wrestling be considered among the oldest sports in recorded history?
Answer: Wrestling has undergone many changes since its original conception. I was just answering this because of nobody answering the question and WIKI did so yeah.
