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The Baking Soda Bomb--Clean Your Silver the Lazy Way

9/25/2013

4 Comments

 
I've talked in a previous post about how to clean your silver jewelry with a cloth or polish.  This time we're going to talk about the lazy way to clean silver.  This method is cheap and effective, and is great for doing large quantities of pieces at one time, or for pieces that have difficult to reach areas on them.  Plus it's super easy and non-toxic! 

You will need:
One bowl big enough to hold whatever you are cleaning
Some tinfoil
Baking soda
Salt
Boiling water
And of course, dirty silver jewelry
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Crumple up a piece of tin foil gently then pull it back apart and line the bottom of your bowl.  (You could also just lay your pieces in an aluminum baking pan.)

Place your jewelry pieces on the foil and lightly dust with baking soda and salt (start with about 1 tsp of each depending on how much jewelry you have in the bowl). 

Carefully pour the boiling water into the bowl so that all the jewelry is covered.  Almost immediately, the tarnish will begin to disappear. If the silver is only lightly tarnished, all of the tarnish will disappear within several minutes. If the silver is badly tarnished, you may need to reheat the baking soda and water mixture, and give the silver several treatments to remove all of the tarnish.   Let the jewelry sit in the dish until all the tarnish is removed and the water has cooled.  You may need to turn the jewelry pieces a few times to make contact with the aluminum. 

Remove pieces from the bowl, rinse in cool water, and dry with a soft cloth. 

And that's it!  So simple.  The solution is safe to pour down the drain and you can throw the used foil in the recycling bin. 


For you science nerds out there, this is what's happening:

When silver tarnishes, it combines with sulfur in the air and forms silver sulfide (Ag2S).  This is the dark gook that we see on the surface of the metal.  To remove the silver sulfide and restore the original lustrous finish, we can either polish the silver by rubbing, which removes a small portion of silver, or we can reverse the chemical reaction by reducing the silver sulfide back into silver.  In the reaction, silver sulfide reacts with the aluminum metal.  The aluminum is oxidized to aluminum oxide (Al2O3) and the silver sulfide is reduced back to silver.  Hydrogen sulfide is also produced in this reaction.  The chemical reaction is listed below.

OXIDATION:   2 Al(s) + 6 OH– (aq) –––> Al2O3(s) + 3 H2O (l) + 6 e–
REDUCTION:  Ag2S(s) + 2 H2O (l) + 2 e–   –––>   2 Ag(s) + H2S (aq) + 2 OH– (aq)
                                                                                                        

3 Ag2S(s) + 2 Al(s) + 3 H2O (l) –––> 6 Ag(s) + 3 H2S (aq) + Al2O3(s)  

The silver and aluminum must be in contact with each other, because a small electric current flows between them during the reaction. This type of reaction, which involves an electric current, is called an electrochemical reaction. Reactions of this type are used in batteries to produce electricity.  How's that for a little throw back to high school chemistry!!

Sources: SciFun Website; UMASS Amherst Chemistry Dept.
4 Comments

Taking Care of Your Silver

6/7/2013

1 Comment

 
One of the frustrations of owning silver jewelry is that it tarnishes.  For most people, frequent wearing keeps silver jewelry relatively clean.  But what about those other pieces that just hang out in our jewelry boxes until we go to put them on, only to find that they are too dirty to bother with at the last minute?
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Yuck!
If you aren't a professional jeweler with access to buffing and ultra sonic machines, what should you do?

Polishing clothes are a good, cheap way to clean jewelry, but take a lot of elbow grease.  The drawback to a polishing cloth is that it's difficult to get into small grooves in metal.  My favorite way to clean jewelry is Wright's Silver Cream.  It is gentle, safe on most stones, and super easy.  A small tub will likely last a lifetime and is worth the investment. 
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After using Wright's Silver Cream.
Most importantly, the best way to keep already clean jewelry clean is to keep it in an airtight zip lock plastic bag.  Exposure to air is what causes the oxidation to take place on otherwise lovely silver.  So save yourself some time and effort by keeping your jewelry in bags.

If you are interested in purchasing a polishing cloth or cream, just click on the links below. 



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1 Comment

    Kate Finley

    I started to work on this blog but that dog up there distracted me with his antics.  Check back soon though--surely he can't keep this up all day.

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