Guo Sen was also a curious man.

In college, he joined a society of strange people who were obsessed with ore as much as he did, and in order to prove that he could, he read some popular science texts and tried to smelt copper by the river.

The process is a little hard, but the results are rich.

After several verifications, he made a lot of copper blocks, and even made a copper brick for his favorite goddess.

Of course, the other party almost shot him to death with that brick.

Guo Sen later withdrew from the club because of this, hiding his merits and fame.

The experiment is actually quite simple.

The first step is to dig a pit and light firewood, put charcoal, then put malachite powder, and cover with a layer of charcoal.

In the second step, take out the blower and connect an iron pipe and insert it into it. And find a piece of wet turf to cover it, and then use the mud by the river to plug the gap to make an air outlet.

The third step is simple. Use a blower to continuously inject air into it for a few hours, paying attention to the color of the flames.

Finally, pour water into the carbon pit and use a wooden clip to pick up the copper and rinse it. (Good boy, please don't imitate)

This makes use of a redox principle.

Charcoal burns to produce carbon monoxide, and when the wet turf that is resistant to high temperatures is covered, the air blowing from the blower inwards raises the temperature inside, creating a very simple furnace.

Prolonged air injection produces a redox process at high temperatures, where carbon monoxide combines with oxygen in malachite to produce carbon dioxide and copper metal.

Primitive man, who didn't even know about fire, certainly didn't know about this chemistry.

Guo Sen didn't expect that it would come in handy at this time.

Holding the still hot copper block with a wooden stick, Guo Sen led everyone to the river, attracting some river water to wash it and cool it down.

Metal, which shone like fire, shimmered in the light of the stars.

The lizards were confused.

Who has ever seen such a thing!

Besides, didn't the leader just throw the green powder into the fire before, and what the hell is this red thing?

"You guys, make it the same shape by making the tip of a gun!"

At Guo Sen's order, several dwarf lizardmen immediately came out, picked up the copper as if holding the moon, and copied a few black stones to make ping-pong.

After a while.

"Chief, this is ......"

The old lizardman saw things he had never seen before.

It has the shape of a stone spear tip, but it feels sharper!

The sparkle was enough to blind his eyes!

The tip of the gun was quickly tied to a wooden stick and handed to Guo Sen.

He took his new weapon and arced into the lush grass by the river.

In an instant, the grass broke in two!

Guo Sen easily cut through the freshly peeled animal skin and cut it into pieces!

Guo Sen is very satisfied, the sharpness of the tip of this gun is really not covered.

Seeing this, the lizardmen hurriedly knelt down.

They all looked at each other.

Who said that I would be the first to overthrow our boss!

Blades made in this way are much stronger and sharper than stone blades.

However, Guo Sen also needs practical experience to show these simple-minded lizardmen how good metal is.

"Alright, you guys do what I did before, get more of this stuff out!"

Guo Sen gave the order, and soon, the lizard people, led by those hunters, began to paint gourds according to the scoop.

Round pits emerged one after another on the flat ground of the square.

While they were digging the pit, Guo Sen piled a circle of rocks and a half meters in the very center of the square, and threw a large pile of dry branches and hay into it.

The flames rose into the sky with a puff of smoke, and the bonfire was ready.

"Okay, come and find some more branches and sticks, put them in the fire for me, wait until they turn white, put in more wood, remember to do as much as possible, do you hear?!"

The next step is to let these guys protect the source of the fire, so that the fire does not disappear easily.

"Chief! Subordinates understand! The old lizardmen beckoned, and immediately some of the lizardmen ran off to work.

Guo Sen looked at this old guy and thought to himself that you are really lazy, so you will instruct others to work.

However, Guo Sen also noticed that he had been watching himself from the beginning, and when he was making a bonfire, the old lizardman even went to the malachite powder to study it for a while.

If he could summarize these techniques and teach them to more lizardmen, he would save himself a lot of trouble.

The profession of a teacher must exist from now on, and he is about to become the first official teacher, Guo Sen feels that this old lizard man should be competent.

"Come here." Guo Sen beckoned at him.

"Chief?"

"You saw the whole process of making my weapon just now, right?" Guo Sen asked.

"Yes, Chief."

"Go and tell them what to do." Guo Sen pointed to the hunters who had forgotten how to smelt copper.

The old lizardman nodded, and immediately began to instruct the hunters.

Make a fire, put charcoal, put malachite powder, and then put charcoal, and make a wooden tube......

Every step the old guy remembers very clearly.

The hunters soon became familiar with this somewhat complicated process under his tireless teaching.

Soon, pieces of glittering irregular copper were produced.

Then, the female lizards who had been waiting for a long time next to them cooled down the water and began to polish it with rocks.

As the sun set, after a while, more than a dozen copper spear tips were made again.

Guo Sen wanted to call the hunters to go to the forest to test the power of the copper spear, but he unexpectedly discovered something.

The lizardmen all gathered around the campfire, and even the guards on the other side of the gate closed the gate and ran over.

Guo Sen was a little puzzled at first, but it wasn't until he also felt the cold air constantly attacking the skin inside the scales from the outside, and he hurriedly sat down with his arms crossed.

Reptiles are ectotherms.

When the temperature decreases, the various functions also decrease, and the body temperature gradually decreases.

Even if the original batch is fierce, after encountering the cold, it will immediately become a rookie.

Guo Sen never remembered that the lizardman actually had such a fatal flaw.

He vaguely remembered that the location of this continent was located in a subtropical region at low latitudes, and in such weather, it would still be a little cool at night.

This sudden drop in temperature also limits the movement of lizard people.

The bonfire crackled and burned violently, and the lizards attracted by the temperature snuggled up to each other and gradually closed their eyes.

Guo Sen knew, let alone going out to hunt, he didn't even want to move.

With his mind in mind, he began to move the land to lower latitudes.

In this way, the lizards in the tropics may not be able to rely on the flames for their warmth when night comes.