How to remove patina from ancient coins How to remove rust from copper coins?

It is easier to regain the shine of the coin by pre-applying a little toothpaste to the surface of the coin and washing it in warm water.

Do not clean copper coins with strong sulfuric acid or nitric acid solutions. This solution washes away the oxides while destroying the coin itself, especially the subtle parts of the coin design.

If the coin is badly corroded (with a uniform black, dark green oxide layer or a thick black shell), it can be washed off with a solution of strong sulfuric or nitric acid. Of course, this method of cleaning is only for those coins that have no particular value.

The cleaning process is as follows: pour nitric acid into a glassware and additionally prepare soda. The coin is placed into the nitric acid solution with tweezers, and the oxide is quickly dissolved.

As soon as the surface of the coin is cleaned, use tweezers to pick up the coin and put it in soda. The coin can then be taken out by hand, carefully rinsed with warm water and dried off. It should be noted that:

Nitric acid, while removing oxides, also makes the surface of the coin numb.

Cleaned copper coins look a little unnatural. Over time, copper coins will still blacken and reappear as oxides. However, there is still no guarantee that a copper coin will produce a uniform new oxide layer and that there will be no black spots on the surface of the coin.

Therefore, it is best for cleaned copper coins to naturally form an antique oxide layer, giving people the feeling of age.

The easiest way to make a coin naturally oxide is to soak a clean, grease-free coin in a 10% dithionite solution for 10-20 seconds. Rinse well after removal and dry with a soft cloth.

Copper coins that have been soaked in a dithionite solution will have a pleasant bronze sheen and will generally never be corroded again.

Varnish the surface of a coin helps preserve copper and copper-nickel coins. It is better to use a glossy furniture varnish, which is easily washed off with acetone.

New coins should be cleaned where they have been touched by fingers before being placed in the box. We found that rust always starts from where the hand touches.

Where's the money? Song Qian's words are to use acetic acid, it is best to use a money washing machine + potion to clear the money, it is best not to wash it, the rust color of the coin itself is a witness of history, and it is best not to wash it.

The effect of diluting hydrochloric acid is better, and white vinegar is used without hydrochloric acid, remember that it must be diluted, otherwise it will damage the coin, and the gains outweigh the losses.

Don't do anything stupid! Although ancient coins are more valuable in good condition, copper coins are worthless when they are rusted.

Removal of patina.

with one hundred and sixty grams of fine wood chips.

Sixty grams of talcum powder.

240 grams of wheat bran.

And together pour in about fifty grams of vinegar.

Mix into a paste.

Painted on rusty ancient coins.

When the wind dries, the patina comes off.

Vinegar is the most effective, but no matter how you use it, you will lose part of the coin itself. Oh, go to a professional place to get it, if it's valuable, don't break it yourself.

Oxidizing substances simple way to take toothpaste.

1. Use a toothpick folded out of the plane (you can't use sharp metal products, which is easy to damage the appearance of the coin) to rub back and forth in the place where the coin is rusty to remove the attachments on it.

2. Place the coins in a large container with the attachments removed.

3. Soak the coin in boiling water at 80-90 degrees for about 10-20 minutes.

4. At this time, most of the dirt has been removed from the coin, and some are still rusty, so gently scrub them with a toothbrush.

5. Place absorbent paper or cotton in a cool and ventilated place, and put the cleaned coins on it to dry.

1. Mechanical method.

Remove coin rust with a knife (preferably a straight knife), a brush (you can use a large oil paintbrush and cut the brown hair of the tip to just a centimeter), a needle or a dental tool to pick, pick, peel and brush. The use of this method to remove rust should pay attention to the weight of the moderate, for the more precious ancient coins should not use this method.

2. Heating method.

This method is mainly used for iron coins with shallow rust. When heating, put the coins into the bearing utensils (such as pots and other metal containers), you can add some water appropriately, heat them with a strong fire for three or four minutes, take out the coins, and then cover the money with a cold and wet towel, and the rust can fall off. For the "reborn" money with serious rust, it is not suitable to use this method.

3. Vinegar bubble method.

Before using this method, wash the ancient money, put it in a small dish, then pour a little edible vinegar, take it out after 24 hours, brush off the rust with a brush, and finally wash the vinegar with water, and wipe the water traces with a cloth to dry.

Fourth, the washing method.

This method is suitable for iron money. Soak the iron coin in distilled water, keep the temperature of the white angel at 98, let it cool down at night, replace the distilled water in time, and check the degree of rust removal until the rust is removed.

Soak it in vinegar, then take a small amount of sand by hand and grind it lightly. This method is safe and simple. By the way, if the copper coin is already very good, try not to grind.

Dilute hydrochloric acid, acetic acid, and sulfuric acid should also be heated.

There are four ways to do this:

1. Vinegar soaking method.

Wash the money, put it in a small dish, and pour in a little vinegar until it is submerged. After 24 hours, take it out, brush off the rust with a small brush, and then wash the vinegar with water after the money lines are clear, and wipe it clean and dry.

This is a relatively simple and commonly used method, which can deal with all kinds of floating rust, but the effect is often not ideal, and many ancient coins will appear yellow on the surface after vinegar, which affects the appearance.

2. Boiling water immersion method.

Sometimes the old money will be covered with a layer of floating soil, but it will not always be washed off. In fact, this so-called floating soil is actually a kind of rust. (A mixture of earth and patina, which is an alkaline hard sticky float).

For this kind of rust, you can first put the ancient money in a bowl, and pour boiling water at a temperature of 80-90 degrees into the bowl until the coin body is submerged. After 5 minutes, take out the money, brush the money and the body with a small brush, and dry it.

3. Dry brushing method.

When the patina or rust is relatively shallow, you should try to avoid using chemical means such as vinegar bubbles, and you can use the dry brush method to clear the money lines.

The specific method is to choose a large oil paintbrush, cut the brown hair on the tip of the pen to only the root, (be sure to make it neat and uniform at the root) and then use.

First put the ancient money to be brushed on the glass plate, fixed, if uneven, you can pad some cloth below, hold the root of the oil brush and brush evenly, pay attention to the force, otherwise the effect is not good, and wait for the floating rust to be brushed, and then wash it with water.

4. Heating method.

This method is mainly used for iron coins with shallow corrosion. The main component of rust is ferrous oxide (FeO), the molecular structure is relatively loose, and the firmness of adsorption with the iron coin body is far less than that of copper coins, so the principle of thermal expansion and cold contraction can be used to detach the rust of some iron coins.