How do you remove the embroidery on a copper coin?

Diluted sulfuric acid, and reaction with patina (basic copper carbonate).

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 rust, you can first put the ancient money in a bowl, pour boiling water at a temperature of 80 to 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: choose a large oil brush, cut the brown hair on the tip of the pen to only 0 5 0 7cm from the root, (be sure to make its roots uniform) can be used.

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.

Put it in vinegar for a while, and the patina will fall off.

It is best boiled in light alkaline water! Rust removal and pulp!

What age is your copper coin, if it is a bronze coin, it is recommended not to remove it, so as to better protect the copper coin.

Patina refers to a layer of oxide that forms on the surface of a copper coin due to its age. ）

Copper reacts chemically with acidic substances (most seriously, liquids), and depending on this property, you just need to find some acidic liquid to wash. If you use sulfuric acid and hydrochloric acid, remember to dilute them before using them.

It can be removed with either sulfuric acid or hydrochloric acid.

Dip some vinegar in medical gauze and slowly take a look. Or try Amway's Libao abrasives.

No matter how good this slurry is, it doesn't need to be removed.

It really won't be so rusty.

Can't it be fake?

You don't need to remove it.,Just keep it like that.。。

Buy a can of "brasso" at the hardware grocery store and come back and rub it, and it will shine immediately! If you choose to use some liquids that are too chemically contented, it will affect the value of ancient coins; Remember that your purpose is to increase the value of the ancient coins and make the exterior surface of the coins shinier, but pay attention to protect the coins from protective damage or unnecessary wear and tear due to care!

If it's your own collection, it doesn't matter, you can use the upstairs method. If it is a collection specifically for the purpose of adding value, it is recommended not to move.

For rust that causes unclear money, you can use edible sour vinegar, sulfuric acid and other strong acids to soak for a while. The practice of counterfeit rust is to blacken, rub and wax the counterfeit with fire. The genuine is black and smooth, while the fake floats and shines.

The formation of green rust is different from north to south, and the degree of oxidation in acidic areas of the geological zone is correspondingly more serious. The north is dry, with little rain and not easy to dry, so the rust is hard. The south is rainy and humid, and the oxide layer is loose and mostly blue-green and dichromatic.

For example, coins of the Southern Song Dynasty were issued in the south, and more of them were released in the south, and due to the influence of the geographical environment, the coins were generally blue-green.

In the pre-Qin period, the characters on metal coins such as knives, cloth, and coins were written in large seals. During the Qin and Han dynasties, the style of money writing belonged to the category of small seals, such as half two or five baht, but there was already a Han style, in which Mangqian was a hanging needle seal. The writing style of the Wei, Jin, Southern and Northern Dynasties is complex.

The coins of the Tang Dynasty were eight points of official books, and after the Tang Dynasty, official books prevailed, and the five dynasties and ten kingdoms were mainly true, seal, and three kinds.

The coins of the Northern Song Dynasty have seals, subordinates, truths, lines, and grass. From the Southern Song Dynasty Guangzong Shaoxi to the Yuan, Ming and Qing dynasties, Qian Wen was mainly based on regular script (true book), and occasionally seals and official scripts. Because China is a multi-ethnic country, Qian Wen also has Mongolian, Manchu, Hui, Dangxiang (Western Xia) and other ethnic minority languages.

For rust caused by unclear money, you can use edible sour vinegar, sulfuric acid and other strong acids to soak, soaking should be turned at any time, observed, moderate, and then washed with water, soft brush and dry. In general, it is best not to use physical means to remove rust from ancient money, otherwise even if it is cleaned out, the condition will be destroyed.

Iron coins are more prone to oxidation than copper coins, so the protection of the rust on the surface of iron coins, including the antique color, should be taken care of, otherwise it will only promote its corrosion and get the opposite effect. In addition, after a hundred years of vicissitudes of life, it is very normal for ancient coins to have patina, and patina is also an important point in identifying ancient coins.

The rust color on bronze coins should generally be kept as original as possible, as most of them are harmless rust. The surface of ancient coins generally forms protective rust, which is also called old rust, and the rust is hard, with green, blue, and red colors. It can play a role in self-protection, and it is better not to destroy.

The patina of genuine coins grows deep into the body of the coin, and it is difficult to remove it from a knife or boil, so it is best not to wash or remove it.

Toothpaste water can be used to remove patina, and here are the steps:

Tools required: toothpaste, drinking glass.

1. As shown in the red circle, this copper coin has a large rust stain.

2. Then find a water cup and squeeze toothpaste into it.

3. Stir the toothpaste well with a wooden stick.

4. Put the rusty copper coin into the toothpaste water.

5. Wait an hour.

6. After an hour, take it out.

7. It can be seen that the rust is removed cleanly, and the effect is good.

At present, the pickling and grinding methods that are rumored on the Internet are serious damage to the coin base plate and pulp, and it is firmly opposed by experienced spring friends! Why can't ancient coins be cleaned with acids (including vinegar, oxalic acid, toilet cleaner, cola (containing carbonic acid), etc.)? First of all, the acid not only erodes the toning and the baseplate, but the bronze coin washes the toning and thus loses its value.

Some people say that acid can wash brass coins, but this is a big mistake. Brass coins made of copper-zinc alloy will dissolve first when exposed to zinc acid, and the base plate will show a purplish red color of copper. Due to the combined action of acidic and humic acid in the rain, it will also lead to the dissolution of copper and zinc in shallow pits, making the bottom plate red.

Moreover, it will rust back after pickling, and it is difficult to regenerate slurry. The reason why the grinding method (including toothpaste brush, polishing, sandpaper, etc.) is not advisable is that it destroys the pulp, and the second is that it soaks the bottom plate and the original natural luster, so that the coin is as bright as new, and it has no characteristics and value of ancient coins, just like handicrafts. Why can't silver dollars be cleaned with acidic rust removal water?

The main reason is that acid will cause damage to the surface of the coin, making the original light become thief, scattered, shiny, and excessively white, and at the same time lead to the passivation of the black rust on the surface, that is, the acid will make the surface of the black rust form a harder oxide layer, which can no longer be washed off.

So how can you not hurt the coin and change the color of the baseplate, but also retain the pulp and quaint feel of the copper coin, and remove the obscuration of rust and dirt, and increase the value of the coin? There is a non-acidic coin rust removal water that has been recognized by many old collectors and is worth a try. It is recommended to use this non-acidic rust removal water, which can retain the simple state of the coin to the greatest extent, retain the pulp of ancient coins and copper dollars, and do not harm the bottom plate and luster of silver dollars.

Share this experience and method, so that everyone can avoid detours and protect our beloved ancient coins from being destroyed by barbaric means. It should be noted that the rust of the base plate is very serious, that is, there is no need to clean the bad coins that have been eroded by the rust and have entered the bones. This rust remover is non-acidic and will never damage the toning and coins, but it is also impossible to repair the heavily corroded toning and baseplate.

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.

Vinegar bubble 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, use a small brush to brush off the rust, and then use it again after the money lines are clear.

Now there are special rust removal sprays for sale, just spray it. A few bucks a bottle.

It is best not to clean up the ancient coins that can see the words and patterns, the rust color of the ancient coins can add to its beauty, and it can prove the identity of its ancient coins, which is beyond the reach of modern imitations, no matter how the counterfeiter imitates it can not be one of the important anti-counterfeiting marks. If you really need to clean up, you can soak it in vinegar for a period of time and gently scrub it with your hands, and then rinse it with pure water; If this method is too slow, you can use porcelain essence and water to soak for a little time, and then wash and wipe dry with pure water, do not use tap water, there is bleach powder or chlorine in tap water, which will cause damage to ancient coins. Good luck and good luck!