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Which liquid takes the longest to make a nail rust?

Hi,
I'm Savannah and I am doing another science project and I have to pick one more liquid. My question is: Which liquid takes the longest to make a nail rust? I'm going to use salt water, vinegar ⇦in bulk on eBay or Amazon [affil links] , and "?" What else should I use.

Savannah P
student - USA
2007

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Try motor oil, Savannah.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

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I am doing a science fair project on rusting nails. I am going to place one nail in four jars each containing different liquids, water, saltwater, bleach, and vinegar. The results will be evaluated by weighing each nail every day for 4 weeks and recording the results. My question is, should I cover the jars or not? Will it have any effect on how fast they rust? Thank You.

Kalina K
Student - Springfield, Minnesota USA
2007

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I would say yes, Kalina, because both vinegar and bleach get their activity from gases that are dissolved into them and will dissipate over time. That's why they smell sharply.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007