You know, before entering the palace, she was very angry.

This kid just relied on himself to like him, so he did whatever he wanted in front of her.

"Don't be angry, isn't it just a few books, I'll pay you." The Emperor said with a smile.

Bai Yun couldn't help but roll her eyes after hearing this.

Are those books? Obviously dozens or hundreds of copies.

It was she who finally got it from outside, and some of them were even lonely, she wanted to see how the emperor would pay for it.

Although she still looked a little angry on the surface, she was no longer angry in her heart, and after a while, she took the emperor to the courtyard to see the thermite reaction.

For those who have not been in contact with these ancients at all, this is definitely a bug-like existence, like a miracle, even the emperor was amazed after seeing it.

What's in this girl's head?

How can you come up with something so unimaginable?

There is no difference between hearing people and seeing them with your own eyes.

The emperor knew that Bai Yunyi was working on a secret weapon before she left, after all, she stayed up from morning to night in those days, and he had to wait for a long time every time he came to her.

He was reluctant to let her work hard.

At that time, he didn't take Bai Yunyi's things to heart, so he arranged for the Black Armor Army to help.

I didn't expect this thing to be as scary as the legend suggests.

"Anything else?" The emperor looked at Bai Yunyi and asked in a low voice.

"Yes." Bai Yun smiled and nodded.

She had already guessed what the emperor was going to do, and before the emperor could speak, she smiled and said, "If the emperor wants to buy it, I can buy it cheaper, and if someone else wants to buy it, it will be much more expensive." ”

"Only sell to me, not to others without my permission." The Emperor whispered.

"Then the price will be much more expensive, if you only sell one, the sales volume will be too low, and the price will have to rise." Bai Yun said with a smile.

"Okay." The emperor readily agreed.

Even if it is someone else, it is impossible for the royal family to ask for other people's things at no cost.

Not to mention that the person in front of him is Bai Yunyi, does the emperor have that face?

"The emperor wants to send someone to say it before, I'm so prepared, as for the price, one or two gold ......." Bai Yun said with a smile.

"A pound of gold?" The Emperor asked in a low voice.

It's too expensive, ......isn't it? It is worth it to be able to dissolve iron into molten iron.

"A tael of gold, a tael." Bai Yun glanced at him and said.

The Emperor was dumbfounded.

Girl, this is a lion's big mouth.

"How much did you use to dissolve the two iron gates of the Hussar Country?" The Emperor asked after thinking for a moment.

"Hundreds of pounds." Bai Yun said with a smile.

The emperor was a little dumbfounded when he heard this.

The Great Yan Dynasty is indeed very rich, but melting the two iron gates will cost him hundreds of catties of gold, which is really expensive.

"Your Majesty, human life is much more valuable than gold, and with this thermite in the future, it will be much easier to break through the city gates, and the death and injury rate of the soldiers will be greatly reduced, which is very cost-effective, besides...... Do you know what is the most important ingredient for my thermite? Aluminum powder. Bai Yunyi was a little unlucky.

When the emperor heard this, he immediately shut up.

Because in this era, aluminum products are very valuable, much more valuable than things made of gold.

In this way, of course, he earned it.

But this girl will definitely not do a loss-making business, there must be something greasy in this.

But he couldn't have haggled anymore, because aluminum was really expensive.