"Oh? What's the best way to do it? Feng Yihan raised his eyebrows.

Yun Qingyan's red lips opened lightly, paced in front of Feng Yihan with his hands behind his back, tilted his head and said, "Then if I solve the problem of eating, what good will it be!" ”

The last two words "benefits" deliberately elongate the tone.

Feng Yihan's eyes lit up, as if a streamer flashed.

He said quietly, "What benefits do you want?" ”

"Of course, the average reward is not worthy of this princess!"

Yun Qingyan thought for a while, "Then you have to promise me one condition!" ”

Speaking of this, she suddenly approached Feng Yihan, "Don't worry, it's definitely not something that makes you embarrassed, and it's within your ability." ”

Yun Qingyan pursed her lips and showed a sincere smile, as if to say, look, I didn't threaten you!

"Okay, I promise you!" Feng Yihan looked at Yun Qingyan with burning eyes, his voice was clear, and the smile in his eyes flashed.

Hearing the satisfactory reply, Yun Qingyan smiled even more proudly, her bright eyes were crooked, like the moon in the sky.

She knew that Feng Yihan's temperament was too difficult, so it was really difficult for him to willingly agree to one thing.

No, she is still smart, a gentleman is a word, and the horse is difficult to chase. She must think carefully about what she wants to do with Feng Yihan.

Next, Yun Qingyan looked at the bonfire in the distance and said, "Since there are not a few pieces of wood that can be used, then we can just use the leftover firewood collected yesterday to make charcoal!" ”

Charcoal? The eldest princess actually knows how to make charcoal?

Feng Qing and several soldiers nearby looked at Yun Qingyan in shock, and Feng Yihan also turned his head.

"Look at what Princess Ben is doing, don't you know charcoal?" Yun Qing smoked.

Everyone shook their heads and nodded, of course they knew charcoal, something that could be used for fire, but they only used it, but they couldn't make it.

"Looks like Yan'er knows how to make charcoal!" The wind is easy to cold and determined.

Everyone else looked at Yun Qingyan with inquiring eyes, how could Her Royal Highness the eldest princess make charcoal?

The dignified princess would actually make this kind of item!

Charcoal, which is the heating thing in the palace, is common ordinary charcoal, and even more rare golden charcoal and so on.

This thing is basically not used much in ordinary people's homes, because the price is expensive, and the production method is also in the hands of several large families.

Seeing the shock on the faces of others, Yun Qingyan soon realized that the method of making things like charcoal was almost a secret in ancient times.

She had heard before that some modern methods of acquiring knowledge are very easy, and the gap between people about the level of knowledge brought about by the knowledge explosion is constantly narrowing.

However, in ancient times, the protection of technology was very strict, an apprentice must go through a grand apprenticeship, and do three years of work for the master for free, during which there is no salary for food and lodging, but there is no salary, despite this, it is not easy for some poor people to learn the real skills, and the threshold for apprenticeship is very high, not everyone can pass.

Under such strict rules, the method of making charcoal is also a secret, so how does Her Royal Highness the eldest princess know?

Everyone's suspicion was nakedly expressed, and Feng Yihan thought of the Taoist priest that Yun Qingyan mentioned before.

Could it be that this is also what the Taoist priest taught Yan'er?

How could Yun Qingyan make others continue to be suspicious? She quickly explained, "Princess Ben once saw an ancient book that recorded how to make charcoal, and she wanted to give it a try! ”

Everyone knew that it was Her Royal Highness the eldest princess who was playful for a while!

Feng Yihan thought it was a little interesting.

"What? Is there anything wrong with this princess wanting to give it a try, and you look at me like that? Yun Qingyan pretended to be angry, pinching his waist and looking at the few people opposite.

Feng Yihan smiled slightly, "Since Yan'er is so confident, then we'll wait and see!" ”

"That's pretty much it!" Yun Qingyan curled the corners of his lips and smiled.

In the following time, Yun Qingyan first drew the general framework of the clay kiln for making charcoal in the camp tent, and then found a few soldiers who had worked as masons at home to discuss it together, and finally discussed a plan.

In fact, Yun Qingyan doesn't know how to burn charcoal, but for her, the most important thing at this moment is to try, how to say that she is also a contemporary young woman who has attended nine-year compulsory education and experienced the devastation of the college entrance examination.

When Qiu'er came in with tea, she saw that the tables in the tent were all covered with white paper, and some patterns were drawn on them that she couldn't understand.

Seeing that Yun Qingyan was so busy, she stepped forward and said worriedly, "Your Highness, stop and rest, don't tire your body!" ”

"It's okay, I'm going to be busy a little longer!" Yun Qingyan said as he kept writing and drawing.

"Princess, do you think this charcoal can be burned?" Qiu'er couldn't see whether Yun Qingyan had confidence or not, she only knew that Her Royal Highness the princess was really serious and busy.

"Someone once said that practice brings true knowledge, and this princess believes that it will be able to be refined!" Yun Qingyan, who had been working hard, raised his head, and his eyes burst into light when he looked at Qiu'er!

"Okay, then Qiu'er is here to guard the princess! If there is anything, you can also tell Qiu'er to do it! Qiu'er said.

"Don't worry!" Yun Qingyan only felt full of energy, at this moment, she was not obsessed with the so-called rewards and success, but the process of exploring the production method.

It's been a long time since I've worked hard like this, and Yun Qingyan suddenly had a feeling of returning to the eve of the college entrance examination, the feeling of racking his brains and constantly clearing the customs, maybe only those who have experienced it can experience.

Feng Yihan left for a short while, and there were soldiers outside who had already asked when to leave, so he went out to take a look at the surrounding environment.

The anthill on the ground kept ants coming in and out, and then looking at the clouds in the sky, there were a lot of cotton wool clouds in the cloudless sky at this time. The wind and cold can almost tell that there may be a heavy rain in the next few days.

"Lord Taifu, this day ......" An adjutant general in the team walked over, looking at the sky and couldn't help but worry.

They haven't reached the next station yet, so is it possible that they will catch a heavy rain?

Feng Yihan said in a deep voice, "Wait first, look at the situation in front of us, it will rain until tomorrow, we have plenty of time to wait for Her Royal Highness the princess to make charcoal." ”

The lieutenant nodded, and at a glance, there were plains in front of them, and there were no shops in front of the village or behind them, and once it rained, they couldn't even light a fire, let alone eat a hot meal.