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Letter 2650
Cleaning pennies for a Science
Project
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My 9 year old son is performing his 4th grade science project on
the ability of different cleansing agents to "Clean" pennies. We
already did the experiment, using water, salt water, root beer,
ammonia, bleach, vinegar, copper cleaner, lemon juice, and dish
washing liquid. I'm sure you know the results: copper cleaner, lemon
juice, ammonia worked best.
Can you give us a little help by describing the chemistry of
tarnish and its removal in terms that a 4th grader can understand?
Thank you for your help.
Richard I
- East Northport, New York
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Ed. note: Please see our F.A.Q. on the
subject, Richard -- I think it will explain all, in terms that a
4th-grade, with your help, will be able to understand.
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WHAT HAPPENS WHEN YOU PUT A PENNY IN BLEACH.
MICHELLE M
- New York
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Usually you end up getting bleach on your fingers or your rubber
gloves, Michelle, accidentally drying them on your slacks or the
tablecloth, and leaving big white blotches on everything. I don't
think kids should use bleach in science experiments :-)
As for the effect of the bleach on the penny, what did you observe
or think you observed? We'll be happy to comment on your findings. Is
it was a post-1982 penny it may have almost completely dissolved.
Regards,
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Ted Mooney, P.E.
finishing.com
Brick, New Jersey
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Note to students with science projects: Please see our
FAQ on Cleaning Pennies; it will
tell you everything you need to know!
March 4, 2009
I'm doing a similar project. When I used bleach it basically
turned it green.
Donna B
- Lebanon, Virginia

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