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If I had four liquids I would see wich one makes metal get rust.

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I would fill four cups with the four different liquids then drop the DIRTY penny's in the different liquids to then scrub them and scrub and scrub and scrub and then compare which penny is the SHINIESTso then I would know who the WINNER is.

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I would experiment with them by soaking it first then I would release it in small doses to a different batch and then I would leave it alone for 2 weeks come back and see what has changed.... I think that this procedure would work.

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If I had four different liquids to experiment with I would start by putting all of them into graduated cylinders. Then, I would put maybe a penny or quarter in each of the liquids, and see if any of them turn into a more valuable metal.

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If I had four different liquids to test, I'd experiment with them by soaking the pennies in the different liquids, all in different containers, and all different pennies

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I would have a multipal coins and I would poor different

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I would use a penny and put it in the different liquids, then would see how the penny would react to the liquids over time. Then, I would do the experiment again and again, at least 17 times.

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I would get four different types of liquid water, soda, pool water, and water with sugar mixed with it . I would put those different liquids in a separate bowl and put the pennies inside and wait for the results.

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If I had four different liquids to test, I would experiment with them by puttin 2/4 of the first liquid, 9/12 of the second liquid, 2/3 of the third liquid, and 10/16 of the fourth liquid then stir it and then have solution!!! Then put the metal in the solution/mixture

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I would have 4 different pans and 4 new pennies and I would pour the 4 different liquids in the 4 pans and then put the pennies in the pans and see what happens.

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To try and make it a more valuable metal I would try dissolvents and soak the coins in that and do it many times. Another thing I would try to do is make the liquid a different tempature to see if it would have a different impact on the coin.

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I think I would test each liquid in the same place but the thing I would change is what liquid. By testing this we can find out which liquid works best in changing back a penny or steel.

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I would do a controlled experiment to see how each liquid makes it shinier.