Let you teach, you play games with the worst class?

After all, Ren Yan sighed slightly again, a little bit moved by the luck of Class Nine...

No, maybe it shouldn't even be called luck.

It must be said that it is luck.

Ever since I took over Class Ninth, these little brats have always encountered various things inexplicably. In less than a year, they have almost caught up with Ren Yan's wonderful previous life.

When I was still a social animal, I didn't have so many things.

"Then...then what's the matter, Teacher Ren?"

After hearing their teacher's explanation, everyone in class nine seemed at a loss for a moment.

In theory, they have encountered enough things, and they have seen a lot.

But in this brand new field, they still instinctively feel a little timid.

"Let's see if our guess is right." Ren Yan stretched her fingers and looked at Awei: "Awei, go to the warehouse and get all the brushes and various cleaning fluids that you may use to clean the deck. .”

"In any case, we have to first determine what this thing is, or its specific age."

"Now it is too rusted, we have to clean it up first."

"Are you sure...use the tool for cleaning the deck?" Ah Wei seemed a little embarrassed: "Mr. Ren, although I don't know much about antiques, I have seen pigs run before I have eaten pork~"

"Shouldn't this thing be a bunch of gray-bearded old historians wearing white coats, holding a magnifying glass, and wiping it bit by bit with equipment that can be as fine as millimeters?"

"You are so simple and rude, are you sure you can?"

After the words fell, Ren Yan squinted her eyes and frowned, bit her molars, and asked rather painfully: "Haven't you cleaned up the rusty farm tools?"

"Although there may be a difference of hundreds of years between the two."

"But you don't think that metal products will be completely brittle after hundreds of years, let alone this thing is still soaking in the sea."

"It's not as delicate as you said, she is not a young lady!"

"The ones you read on the Internet are all the final fine processing. There are not so many things about this newly discovered metal product. If it is too fine, it may not be cleaned up~"

After all, Ren Yan waved her hand with a stomachache on her face: "That's all right, all right, don't be too hesitant, just take it if you tell me, and you will learn how to deal with it simply like me later."

"Oh~~~"

Hearing this, Ah Wei agreed, and ran towards the warehouse with a few people.

After a while, I returned again with a big bag and a small bag.

Judging from what Ah Wei brought back, the other party carried out his request very well, but there may have been a slight deviation in understanding.

Looking at the iron pin in the cleaning tool, the corners of Ren Yan's mouth twitched uncontrollably again:

"It's not... let you take something like a brush, what are you doing with the happy ball?"

Awei replied seriously: "This thing is very efficient in cleaning stubborn stains, I think you can use it!"

Listening to the painstaking efforts of the other party, Ren Yan lowered her arms weakly, and the words of admonishment were deeply stuck in her throat.

"Okay, okay, come here, come here, let's start a small stove today, and teach you how to clean up potential historical relics in a simple way!"

Ignoring Ah Wei, Ren Yan looked up and scanned around, and called all the students in Class [-] over.

Because the current 'suspected' rock is too big, there is no need for a special stand, and all the students can see it all.

After seeing everyone standing up, Ren Yan took out a brush from the pile of tools, and after sticking it hard in a bottle of white vinegar a few times, poured all the white vinegar on the subject.

Glancing at his watch, he waited patiently.

While waiting, he explained to the students in Class Nine:

"In the treatment of historical relics, in principle, the use of any chemical agents is not allowed, because we are not sure about the composition of the cultural relics. If one accidentally causes damage to the cultural relics, the loss outweighs the gain."

"So, generally speaking, in the derusting of cultural relics, the most used thing is vinegar. The acidity of vinegar is weak, and it can also play a role in derusting after a long time. It can be regarded as the safest derusting method at present. "

"And this method is called vinegar soaking method in cultural relics cleaning."

"Other than that, there are mechanical, boiling water soaks, dry brushing and heat methods."

"However, the other methods have too many limitations compared to vinegar soaking, and need to be used in specific places."

"For example, for relatively small impurities, mechanical methods are often used. It takes a lot of patience and perseverance to carefully remove excess impurities with a picking needle."

"Soaking in boiling water is mostly used to treat soil rust. If you soak in water at 5 or [-] degrees for about [-] minutes, a large amount of soil rust will fall off, and other rust will also loosen."

"At this time, it is often used together with the dry brush method. When the rust is not heavy and can be easily cleaned, use a soft brush to remove impurities. This is the method you often see on TV."

"As for the last heating method, it is similar to soaking in boiling water, but it is mostly used to treat slight rust or cultural relics that cannot be soaked in water."

"Our current one is too rusty, obviously it can't be used."

"So the best way is to soak in vinegar."

"The time is at least 10 minutes, and some cultural relics will even be soaked for 24 hours, but we don't have enough time, so I won't demonstrate so much."

"Remove the rust on the surface and look at the outline. It will take about 10 minutes."

After Ren Yan finished speaking, the students in Class Nine nodded to express their understanding.

Many people even habitually took out their mobile phones to make sticky notes.

Ten minutes later, Ren Yan took a brush and carefully began to brush off the outermost layer of rust:

"This step, even if it is a dry brushing method, is still different, because I now know that the rust is too thick, so I don't need to pay too much attention to my movements, as long as I control my strength."

"The real dry brushing method is to control the range of the brush within 0.5-0.7 centimeters from the cultural relics. If it is too close, it is easy to damage the structure of the cultural relics."

"It's too far away, and it may not be cleaned up."

"So this step requires a steady hand."

After carefully cleaning for more than ten minutes, the rust on the surface of the object to be cleaned has obviously faded a lot, and there are also various rust spots that have fallen off on the deck.

[Recommended, Yeguo Reading and Chasing Books is really easy to use, download .yeguoyuedu here, everyone can try it soon. 】

Thanks to the blessing of long-term immersion in seawater, these rusts are not very stubborn.

But when the rust on the surface fell off, Ren Yan frowned again.

Because within these rust spots, there is a faint turquoise.

In line with its metal nature, a thought suddenly entered Ren Yan's mind.

And there is obviously more than one person who has the same idea as Ren Yan.

After seeing these turquoise colors, Wang Yu raised a question:

"Is this thing made of copper?"

Ren Yan nodded: "And it may be more than that simple."

"The layer of stone we saw before may not be stone, but a shell made of a layer of other substances."

"Look at this..."

With that said, Ren Yan tapped the other side of the object to be cleaned: "These stones have begun to separate after simple cleaning, and there is also a layer of patina exposed inside."

"So this layer looks like a stone, and there is a high probability that dust has accumulated, or the surface layer was deliberately painted with some materials by the ancients..."

"So this thing is a complete metal product?" Sun Hao blinked.

"No, strictly speaking, it is a bronze product." Wang Yu shook his head.

"Is there a difference?" Sun Hao was startled.

"Of course there is. If it is really bronze, then our previous speculation about an anachronistic relic may be wrong."

"After all, bronze has been used by humans since BC, and the first gears appeared in the 13th and 14th centuries."

"So, in the days when piracy was rampant, it was quite normal to have artifacts with bronze gears."

"Not necessarily." Hearing this, Ren Yan shook her head: "The gears of the 34th century must be at least half a meter in size, but the one in front of us only looks about a dozen centimeters."

"The gap is still huge."

"Besides, we don't know what's in it until we figure it out."

Ren Yan frowned and looked at the things in front of her, suddenly there was an illusion in her heart that Class Nine had caught a big treasure.

"Go, Ah Wei, boil water!"

"We'll have to clean it up and see what this thing is."

After thinking briefly, Ren Yan looked at the monitor.

There was no ink marks on student Awei either, so he immediately took Li Cheng to the kitchen to boil hot water.

Ten minutes later, the upper body of the cleaning pair became wet, and the water vapor of the bird floated from it.

This time, not only Ren Yan, but also some more careful students in Class Nine picked up their brushes and joined the cleaning army.

With the demonstration of my own teacher, even though everyone in Class Nine is still a little guilty, the progress is much faster after all.

When the sky was getting dark, they finally cleared up the overall outline of the object to be cleaned up.

But instead of getting better, everyone's expressions became more dignified.

In front of them is a rectangular bronze box-like object, covered with turquoise patina.

At the shell, as Ren Yan guessed, there is a layer of lime shell as a protection, but at this time the lime shell is close to falling apart.

The body of bronze is exposed everywhere.

At the same time, there are still some patterns on the shell, most of them are round, and many places are completely hollowed out.

And inside this hollow, there are densely packed stacks of gears.

Although they hadn't been cleaned well, the criss-crossed appearance still betrayed it deeply.

The side of the bronze body also confirms this very well.

Wherever it can be cleaned, the appearance of the gears should have been exposed.

Even if some small pieces fell off, even after the baptism of time, these sealed gears still meshed with each other without any deviation.

The workmanship seems simple, but it gave everyone in class nine an unprecedented beauty of mechanical roughness.

They look crude, but neat and tidy.

It seems incomplete, but it has passed the test of time and appeared in front of them in a relatively complete form.

At this moment, even if Ren Yan didn't need to say anything, everyone in Class Nine, including the netizens, had already confirmed one thing.

This thing must be the legendary anachronistic relic.

This seemingly rough but exquisite workmanship is not easy to make even if it is a modern craft.

Not to mention, it was still in the era of rampant pirates...

Chapter 372 Difference Machine and Double-Entry Bookkeeping 【5200 Full Order】

"Old Ding!"

"I can't say anything this time!"

"The thing that Class Nine salvaged is of great significance, and those laymen of them must not be allowed to waste everything!"

"If it is really an anachronistic relic, as they said, do you know how much shock it will cause to the entire archaeological world?!"

Longguo, in the office of the General Administration of Education.

Ding Guoxiang held the receiver of the landline far away with a look of disgust.

But even so, an old and mid-spirited voice could still be heard clearly through the earpiece.

It's not someone else on the other end of the phone.

It was Cao Guorui, the director of the General Administration of Archeology whom I had contacted just now, and also his old classmate.

The old man had always had a fiery temper since he was young, and he thought that the other party had restrained himself a lot when he was old.

But who knows that this product is just a superficial effort.

Now when it comes to antiques, the old vigor is back...

After the other party's yelling slowed down a bit, Ding Guoxiang put the phone receiver close to his ear:

"Didn't it be agreed before? This matter will be handed over to our Education Department, and your Archeology Department will not be involved."