Wednesday, September 29, 2010

Coin Trick

There's a semi famous trick of turning copper coins into silver and gold coins.  Notice the word 'trick'? It's not actually real silver and gold but it gives a nice decorative effect.

For this trick you will need zinc sulphate which can be bought cheaply online.  Or you can make it by dissolving zinc metal into sulphuric acid.

Silver Coin

Drop in some zinc metal and a clean copper coin into a strong solution of zinc sulphate and bring it to boil for about 15 minutes.  The zinc and copper must be touching.  The coin will be coated in a layer of zinc metal which looks like silver.

Gold Coin

To turn a coin gold you must first coat it in a layer of zinc, as shown above.  Then you must heat it to about 300 degrees Celsius until the zinc and copper form a coating of brass.  Drop in into some water to cool it down and it will have the appearance of gold.

Protip: This works on anything copper, so you can also make gold and silver bling.

28 comments:

  1. Hey I did this in chemistry, the teacher told us that way back in the day kings and emperors would have chemists try and make things into gold and if they failed they would be killed. Interesting post

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  2. hm, looks like i'm going to my chemistry lab tomorrow ;)

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  3. Cool stuff. I love these experiments.

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  4. I remember doing this in Chem class in middle school hahaha.

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  5. Now I how those pennies got golden. GOLD QUARTERS HERE I COME.

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  6. i just made a whole bunch of these

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  7. can see a pics or video whit that?:)

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  8. Why is your blog so fun to read? :)

    http://tornadojackson.blogspot.com/

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  9. Great post!
    looking forward to reading the next one

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  10. great blog concept...i love science, especially the hands on kind

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  11. lol very interesting good stuff

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  12. I tried the gold coin trick in my chemistry class and it worked!

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