Maintenance and preservation methods of ancient coins

There are more and more people collecting ancient coins, which also has great appreciation space and potential. What is the secret of how to collect? Then let's take a look at the maintenance and storage methods of ancient money that I carefully recommend for everyone, hoping to help you.

Maintenance and preservation of ancient coins

1. Maintenance of ancient currency

Talking about the Rust Removal of Metal Coins Generally, the rust color on copper coins should be kept as original as possible, because most of them are harmless rust. However, when the ancient coins are rusted into pieces, the coins are unrecognizable or have harmful rust, it is sometimes necessary to remove rust.

Soil rust is generally a mixture of soil and calcium and magnesium salts or a mixture of soil and copper rust. Before treatment, gently brush off the dirt on the ancient coins with a soft brush dipped in water, and then immerse them in glacial acetic acid diluent (glacial acetic acid is a colorless and transparent acidic chemical solvent, originally used in photographic darkrooms). After an hour, touch the old money with a stick until it is scattered. Then put on rubber gloves, hold an ancient coin in one hand and gently scrub it with a brush in the other. There is no need to wipe off the bronze rust on the back of ancient coins without inscriptions and marks, so as to maintain some characteristics of unearthed ancient coins. After rust removal, rinse off glacial acetic acid solution with clear water, absorb water with a soft towel or cloth, and finally lay it flat on clean paper to dry.

In the absence of conditions, rust can also be removed by soaking in vinegar. This rust removal method takes about one day and one night to barely dissolve the rust, which is extremely inefficient.

For powdery rust that cannot be removed by soaking, sludge can be used to wrap the rust removal part, concentrated acetic acid can be dripped into the dropper to decompose the rust, and the rust can be removed by gently removing the rust with the needle tip, scrubbing with water and neutralizing with ammonia hydroxide.

Fetal hair rust is the rust layer of ancient money corroded from the inside out. In this case, the money body becomes thicker, and most of them are sealed and kept without rust removal.

Generally, gold and silver do not need rust removal. In a few cases, when rust removal is really necessary, it can be soaked in 15% glacial acetic acid solution or 10% sulfuric acid solution. If fetal hair rust is found on gold and silver coins, you can use a brush dipped in 5% trimethyl resin to coat the second and third layers, which will play a sealing role.

There are many ways to remove rust. If the rust is light, it can be properly heated and peeled off by using the principle of thermal expansion and cold contraction. Glacial acetic acid soaking method and heating method can not be used for iron money with serious corrosion. For iron coins that need special rust removal, zinc caustic soda electrochemical reduction method and caustic soda solution electrolysis method can be used. Hydrogen furnace reduction method can be used for more expensive iron money.

2. The storage of ancient money

Rare metal coins were once decorated in ivory boxes and bone boxes. According to the current conditions, it can be put into a plexiglass round box and filled with nitrogen for preservation.

Gold and silver coins can be put in the box, or in the safe if possible.

Ordinary metal coins are matched by age and edition, and put into boxes in order. The wooden box is 60 cm long, 40 cm wide and 8 cm high, with a thin layer of foam nailed to the bottom. The old money is back, to protect Qian Wen and to check the registration number. Ancient money was fixed around with a few pins. There are also holes around the ancient coins on the cardboard, which are fixed with wires. There are three layers of cardboard stuck together, and the top layer is carved into a round hole according to the size of ancient money. Put the ancient money in and cover it with plastic film.

If you have a large collection of ancient coins, you can also register them for easy preservation and reference. The contents of registration include registration number, name of ancient coins, texture, weight, diameter or size of coins, grade, current situation, source, and explanation, and then rubbings and photos are attached.

Key points of investment in ancient coin collection

There are more and more people collecting ancient coins, because ancient coins have certain collection value of RMB and great appreciation space and potential. However, not all ancient coins have collection value, so when collecting ancient coins, it is necessary to master certain identification skills and be targeted. According to years of experience, I think that collecting ancient coins should learn to use the following six words well:

Ancient rust is naturally formed in underground closed space for a long time. Although it is rich in flavor, it is not irritating. The new rust is made by chemical means, so it tastes pungent.

Listening to the sound of ancient coins thrown on the ground, it is not good to be too stuffy or too loud. Nowadays, people who play with the collection of ancient coins like a crisp muffled sound, and such ancient coins have a great chance of being genuine.

The feel of ancient coins is also the fastest way to judge authenticity. Ancient coins handed down from ancient times are generally heavy and moist as jade. After being played by the ancients, it is particularly textured.

Taste is also a way to judge the material of coins. Gold coins are slightly sweet, silver coins are slightly salty and copper coins are slightly bitter. This method is not suitable for players who are new to the collection of ancient coins.

For old collectors, eyes are often the best? Testing instruments? . When you collect ancient coins for a long time and are familiar with their charm, you can judge their authenticity through their characters, sizes, shapes and characteristics of the times.

After removing some superficial disputes, we can comprehensively examine the authenticity of this ancient coin with our hearts.