To identify rust stains, if you don’t want to have too much trouble, you can also use a magnifying glass to observe.
In the area burned by the hot needle, you will find that the gelatin has been melted and then solidified, forming a semicircular groove according to the shape of the hot needle.
Real patina is a naturally grown mineral crystal that neither melts nor burns easily at high temperatures, nor does it have a sour or other odor.
If you haven't found it yet, it's time to take a step closer.
At this time, you can use a knife or other tool to take a piece of the patina on the surface of the copperware and observe the leather shell exposed under the patina. What is exposed under the fake rust is directly copper color.
Underneath the patina, there is usually a dark brown or silvery white oxide film.
The surface of smoked copper is dyed with pigments to form a black or red oxide layer on the surface. Often this oxide layer has no luster.
It needs to be polished with cotton cloth, blanket or basswood charcoal, or mechanically polished with a jade polishing roller.
The protruding parts of this type of fake oxide layer are bright and the recessed parts are dark.
Use a dry hard cloth or other items to quickly rub on the copper rust surface to heat the surface and then smell the smell.
Some fake rust will emit pine smell, plastic smell, paint smell or other odors such as 502 glue.
In fact, identifying bronze ware is now far from as simple as many people imagine.
If possible, it would be best to use all kinds of modern tools, but even so, there are times when mistakes are made.
Sometimes, there are many ways to make rust, which makes it difficult for people to guard against.
Not to mention other things, if some raw materials for making porcelain are used to make rust on bronze, all the methods of identifying the rust color mentioned above will be useless.
At this time, you can use the third-generation Charles color filter used in jewelry appraisal to identify patina, which is very effective.
All patinas will not change color under the filter.
Most of the various fake rusts made with green and blue chemical pigments will turn red under the color filter.
Especially the fake rust that uses enamel glaze and is fired at low temperature. This kind of fake rust is neither afraid of fire nor water. If you use a hot needle, water will not work.
But because the blue in the enamel glaze contains cobalt, its blue or green will turn into red under the third generation Charles color filter.
After various methods, it is still easy to distinguish whether the rust color is applied.
Through the above methods, most of the high imitation bronzes can basically be identified.
But if you want to more accurately identify the authenticity of bronzes, you still need a lot of practical experience.
Of course, this cannot be learned and mastered in a day or two. It requires more effort to develop a pair of discerning eyes.
"Han Dynasty Lingshan type three-legged frog sun pattern war drum!"
"If the identification is correct, the achievement value will be increased by one!"
"General Fubo of the Han Dynasty marched to fight the big copper cauldron!"
"If the identification is correct, the achievement value will be increased by one!"
"General Fubo of the Han Dynasty marched to fight against the small copper cauldron!"
"If the identification is correct, the achievement value will be increased by one!"
It is not easy to add three achievement points, especially the descriptions of the last two cauldrons are more accurate.
Because at that time, it was the South China Sea Island that General Fubo pacified.
This indirectly proves that Wu Er did not lie, and these three items did come from Nanhai Island.
After confirming that the items were genuine, Chen Wenzhe began to feel distressed.
This bitch Wu Er actually carried these three national treasures manually to the antique city?
Thinking about the transportation process, these three national treasures were not treated specially, right?
You know, transporting cultural relics is comparable to transporting gold!
According to the relevant regulations of our country, the requirements for the transshipment of cultural relics are extremely strict and are equivalent to the transportation of gold.
If you are transporting national treasure-level bronzes, the relevant departments must make an exception to "clear the way" for precious cultural relics along the way.
Also, when transporting national treasure-level bronzes, wooden boxes must be custom-made for them, and foam up to 10 cm thick must be added inside to ensure that the cultural relics are not damaged again.
None of these protective measures are now available, so these already severely damaged bronzes must have been damaged twice, even three times, or four times.
Of course, it may not only be the damage caused by Wu Er to them, but also their original owners. I'm afraid they didn't think about protecting the transportation, right?
After all, it is bronze, how can it be so delicate? This is probably the common thought of all ordinary people, right?
Perhaps seeing Chen Wenzhe's heartache, Wu Er was a little frightened.
"Brother, is there something wrong?"
Wu Er had to worry. He had contacted Chen Wenzhe several times and he knew that Chen Wenzhe would not tell lies.
Of course, if it is your own problem, others will not remind you.
However, as long as you ask, Chen Wenzhe will generally not cover up and lie.
"There must be something wrong. For such serious damage, the price will definitely not be high!" Chen Wenzhe said directly.
"The damage was already there, and I didn't want to sell it for tens of millions!" Wu Er was relieved.
Chen Wenzhe glanced at Wu Er, didn't he want to sell tens of millions?
He wanted to, but could it be sold at this price?
Although these three bronzes are real treasures and are of high value, it is really impossible to sell each one for tens of millions.
The main reason is that the preservation is so poor. Even if it is large and the craftsmanship is exquisite, it loses a lot of points.
Looking at the missing three-legged frog pattern on the bronze drum, as well as the bottom feet, these have all been corroded.
It is not difficult to repair it, but after repairing it, it will definitely not work again.
However, those two copper cauldrons can still be used to cook food after they are repaired!
During the repair process, the principle of repairing it as before must be followed, and harmful reagents must not be used.
In this way, the integrity of the copper cauldron and drum is guaranteed to the greatest extent through a combination of physical and chemical methods.
It is not too troublesome to repair. We use 1 mm thick copper plate drawings, cut and shape them, and bond them with epoxy resin. Finally, they are primed and aged. This will definitely make the repaired part as natural as the original cultural relics.
Of course, there is still a lot of craftsmanship involved, and all of them are indispensable.
The rust needs to be removed first, then the gaps must be filled, primed, and finally the rust must be done.
As long as these four processes are completed, the repair of these copper cauldrons and drums can be completed in a few days.
"Boss, boss..."
Li Jinli's palm kept shaking in front of Chen Wenzhe's eyes, but his eyes had no focus!
"What are you doing?" After being slapped, Chen Wenzhe came back to his senses.
"Boss, what are you thinking? This wandering is too serious? Those who don't know may think you are possessed by evil spirits!" Li Jinli said helplessly.
With this kind of behavior from your own boss, why does that guy Wu Er still raise the price desperately?
I don’t know where all the boss’ original cunningness has gone? How come his performance is so subpar?
Chen Wenzhe came back to his senses and said nonchalantly: "I am thinking about how to repair these three bronze vessels. Most people cannot repair such defects!"