Mình mới check thấy có 2 cách đơn giản sau, bạn thử xem thế nào. Nếu ko được mình sẽ tìm tiếp cách khác. Tháng 7 này mình sẽ về VN, có gì lúc đó hậu tạ luôn nhé...hehe...
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Cách 1: ngâm trong hỗn hợp muối và dấm, sau đó chùi rửa
Trích:
Step 1:
Place 1 tsp. salt in a small container. You'll want to use more if you plan on cleaning a lot of copper coins.
Step 2:
Mix vinegar into the salt. Add enough to soak all of the salt.
Step 3:
Apply this mixture as a paste to scrub the copper coins. You can clean them with your fingers or a tooth or nail brush.
Step 4:
Soak badly stained copper coins overnight in the salt and vinegar solution. Check the coins every couple of hours to determine if they are ready.
Step 5:
Use a brass brush on copper coins you don't want to soak or scrub. Rub it gently in a circular motion.
Step 6:
Wet your copper coins and rub baking soda into them with a toothbrush. This is a good method to use when you're afraid of scratching the coins with a regular brush.
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Cách 2: ngâm trong H2O2, có gia nhiệt một ít
Trích:
Make sure the artifact/coin is free of any oil coating like olive oil if you previously had soaked this object. The oil coating prevents the Hydrogen Peroxide from working on the dirt.
Put object to be cleaned in disposable plastic bowl and then pour Hydrogen Peroxide on top until it is at least a half an inch above the object to be cleaned.
Using the lamp as a heater, I position the lamp to within 2-4 inches of the bowl. This heats up the solution. Be careful not to cause anything to melt from too much heat, use common sense for this part. A Heat Source is NOT necessary, but it does speed up the cleaning significantly...
note: you can use a nicrowave to heat the peroxide up first, but be careful andplease use a safe container with no metal lid on it put the coin in after the heat up in the micro wave.
if the solution is hot enough the boiling of the Peroxide should be very evident to you and should remind you of a geyser. Once it is cooking it sprays the bubbles and smokes a little also. This should continue for anywhere from one hour to two or three.
Periodically remove the object if you want to check on the progress. I usually then lay it on a napkin and take a cotton swab and start to gently rub and see how much crud is coming off the object. It might take several hours or more to get real clean. You might even have to repeat the entire process if the object has a lot of stubborn crud on it.
When the bubbling of the Peroxide stops the cleaning also is done. If it needs more cleaning start over again with fresh fluid.
Keep your cotton swabs wet with the Peroxide while gently rubbing, this will prevent scratches.
When done with your cleaning, rinse the object well with water.
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