"This is black iron, this is green iron, and the smallest piece is yellow iron......"

In the equipment room, Zhang Chengqi took out three pieces of metal materials and put them on the table to show Ge Tiantian.

"Is it all iron? What's the difference? "Ge heard for the first time in three days that in addition to pig iron, wrought iron, and steel, there are also black iron, green iron, and yellow iron.

"This is not the white iron used to make ordinary weapons, these are all brought out by demon beasts from the central forest, and they are very rare outside. Come, grab it and feel it yourself! Zhang Chengqi asked Ge Tiantian to personally feel the difference in materials.

White iron, which is the iron ore of the outside world, is called white iron because of its white and silvery-white material.

Ge Tiantian curiously picked up the first piece of metal, black iron, as the name suggests, black iron has a dark appearance, and blue iron and yellow iron are also as the name describes, the surface is navy blue and light yellow, respectively.

"It's heavy! This density feels like lead! This first piece of metal brought a surprise to Ge Tiantian, if Zhang Chengqi didn't say that it was called iron, he would have thought it was a heavy metal such as lead.

"Xiao Ge, your statement is not accurate, the density of black iron is greater than that of lead, about the density of two white irons, compared to lead, black iron also has strong characteristics, and it is a necessary material for building heavy weapons." Zhang Chengqi corrected Ge Tiantian's words.

After hearing this, Ge Tiantian suddenly remembered the giant axe that broke the mountain, if the giant axe itself was made of black iron material, then its weight would be easy to explain.

After learning about the black iron, Ge Santian continued to look at the green iron behind him.

"This piece of green iron is literally, very light, could it be other varieties of metal aluminum?" Ge Tiantian picked up the green iron on the table and threw it high, took it back, and played with great interest.

"Hahaha! This green iron! It is the blue of the color, not the lightness of the weight! Zhang Chengqi laughed and corrected Ge for three days.

Ge Santian was suddenly embarrassed, he guessed wrong twice, can he not be embarrassed!

"However, it is not wrong to call it light iron, the density of blue iron is only one-third of that of white iron, it is not aluminum, its properties are similar to iron, however, it is lighter and stronger than white iron, and at the same time the blade created is sharper, and there are no more than 100 people in the entire middle capital city who have blue iron weapons." Zhang Chengqi explained.

"In this way, Qingtie must be more expensive!" After listening to Zhang Chengqi's introduction, Ge Santian couldn't put down the light rail, and the weapon of this material was just right for him to use.

"The really expensive thing is this piece of yellow iron, don't look at it, it's only the size of your thumb, but to calculate its value, the first two pieces add up to less than a fraction of it!" Zhang Chengqi proudly introduced Huang Tie, who appeared last on the camera.

"What does it do?" Ge Tiantian asked curiously, in his opinion, the black iron and the green iron are comprehensive enough, what kind of characteristics will the yellow iron have?

"You, Ying girl, including myself, we don't need that little bit of yellow iron, and the only one present who is qualified to use it is this mouse." Zhang Chengqi glanced at Ge Santian and Shui Yueying respectively, and finally pointed to Yuzu.

Yuzu heard Zhang Chengqi call it a mouse again, and immediately became unhappy, and was about to open his mouth to scold, but Ge Tiantian covered his mouth with a slap.

"Could it be related to the demon element?" Speaking of the difference with Yuzu, Ge Tiantian immediately thought of a Qi Transformation Rank cultivator who could release the Demon Yuan.

"Not bad! Huang Tie can not only allow the user to condense the demon element faster, but also comes with a certain degree of spell amplification effect, which is hard to find, and it is a dream of Qi cultivators. Zhang Chengqi said.

After Yuzu heard Zhang Chengqi's introduction of Huang Tie's ability to increase the strength of the spell, he immediately opened Ge Santian's palm with his claws and shouted:

"Allah wants, Allah wants a weapon with a spell amplification effect!"

Ge was speechless for three days, this big hamster is not stupid at a critical time! Know what a spell kicker is! But, why is it like a fool every day, you know how to sleep.

"Uncle Zhang, let's open the skylight and say something! I need a knife made of light iron, and the deer outside, make a head armor for it with light iron, make four saddles out of black iron, and, yellow iron......" Ge Tiantian can't wait to make a list.

"Wait, wait......" Zhang Chengqi hurriedly stopped Ge Santian from continuing.

"Xiao Ge, I said so much, just to let you know how precious these three materials are, how difficult to obtain, black iron and green iron aside, that small piece of yellow iron is my most valuable treasure, and there is only such a small piece, you can't find a second weapon shop in Zhongdu City bigger than mine, if it weren't for the chance to save a demon beast, I wouldn't have been able to get this priceless treasure."

I don't know how, Ge Santian has a very strong impulse to despise Zhang Chengqi.

Isn't it just going to raise the price? Yellow iron is indeed precious, but it is also relative to qi cultivators, to ordinary cultivators and ordinary half-moon clans, the value of yellow iron is not as good as black iron and green iron, and even like ordinary white iron. Qi cultivators, there is not a single one in the Ten Mile City, and even if there is one in the Central Capital City, there will not be much, maybe one, maybe two.

"Alright! In this case, let's not talk about yellow iron first, but about this green iron and black iron. Ge Tiantian is very clever, so naturally he won't fall into the trap, so he immediately opened the topic.

Ge is not fooled for three days, Yuzu wants to be fooled very much! It was very happy with that yellow iron! However, when it was about to protest, Ge Santian was ready to cover its mouth! Forced to stuff the words of Yuzu back into his stomach.

Seeing that Ge Santian didn't plan to ask for yellow iron, Zhang Chengqi seemed to be a little disappointed, but as he said at the beginning, he opened the door to do business, and he still sold black iron and green iron.

"Hmmm! That's fine, too! Walk! Measure your horned deer first! ”

Zhang Chengqi not only speaks in a hurry, but also does things in a hurry.

"Couldn't be better!"

Ge Tiantian is also the kind of person who does what he says, and at this moment, it seems that he has found a soulmate.

However, Shui Yueying was a little angry, the two men didn't pay attention to her from beginning to end, and didn't ask her if she needed to customize a weapon, although she really didn't need it.

After some bargaining, in the end, Ge Tiantian paid two hundred gold coins to customize a saber, plus a full set of equipment for the old horse of the horned deer.

Ge Tiantian looked at the empty wallet, and smiled helplessly, he couldn't imagine that he would also be short of money one day.

"Uncle Zhang, look, the money has also been given to you, why don't you give me that little piece of yellow iron!" Ge Santian naturally won't forget about Huang Tie, and finally found a weapon suitable for Yuzu's use, and he can't miss anything, otherwise, Yuzu will be unhappy and run away, and Ge Sansan's loss will be great.

"No! No way! That's a priceless treasure, you can't send it, you can't send it! Uncle Zhang immediately refused.

Ge was not discouraged for three days, and continued to move with emotion and reason:

"This treasure must be called a treasure in someone who can play its value! I can't use it, you can't use it, and no one in Zhongdu City uses it, so what's the use of it? Not as good as the beauty of adults, treasures for heroes! ”