"Wait a minute, the queen mother! Erchen will go back as soon as he goes. ”

Li Chengqian said, and Empress Eldest Sun nodded.

After that, he left here and let Guan Lishi serve Empress Changsun here.

And he went to his own laboratory.

A laboratory close to modernity.

Because so many ministers came here to wait during this time, he had to build another laboratory in the palace.

It's a huge space, and although it's located in the depths of the palace, it's lit inside.

Glass mirrors are reflected everywhere, and as long as it's not night, it's almost as bright here as it is outside.

He walked to a scented place where a large amount of soap was stacked.

There are different scents, but he didn't come because of the soap.

Li Chengqian has been thinking in his heart: dry skin is nothing more than the need to use a chemical, that is, glycerin, and the easiest way to obtain glycerin is to separate from soap.

As far as he knows, the liquid left after the soap is made is a mixture of glycerin and caustic soda aqueous solution, and then the caustic soda can be neutralized by acetic acid titration, and then the sodium acetate is separated by a recrystallization method, and finally the water is removed with quicklime, and the remaining glycerin.

So it just so happened that he had a lot of soap leftovers, glycerin or something, and it wasn't very easy to make?

In fact, he didn't have to pay attention to the words of the eldest grandson.

But in order to gain the favor of Empress Changsun, let him stand up to Li Shimin well, speak for himself, and don't let Li Shimin have bad feelings about himself.

Moreover, he has to test whether glycerin can actually be produced.

This is very important!

Why? Because glycerin is an indispensable product for making gunpowder.

With glycerin, will gunpowder be far away?

But now there is no hurry to study gunpowder, and if you want to do it, you will make the most powerful thing, at least not now.

But when he appeared, he was greeted by someone.

"I've seen His Royal Highness the Crown Prince!"

There are dozens of people here, coming and going, and they are researchers in this laboratory.

Li Chengqian said directly:

"Help Ben King make this liquid underneath... So... So...... Then purify! ”

These people are actually beings who have been trained in the ability to teach, and their research ability is comparable to that of the scientists of the nineteenth century.

So, he simply said some methods, and these people completely understood.

"Understood, His Royal Highness the Prince!"

It doesn't take much time to purify glycerin.

Li Chengqian began to make other preparations for other people.

What he wants to create this time is something, and it will be the existence of the Tang Dynasty in the future.

Of course, he will not be known to outsiders about this laboratory.

This is the foundation of Datang's strength.

"How long?"

"A quarter of an hour will do!"

"The king is waiting here. Also, come on! Bring the king's small glass bead bottle! ”

"Yes!"

……

After a long while, Li Chengqian came out of the laboratory.

At the same time, Empress Eldest Sun was also waiting a little irritated.

As soon as he came, he asked:

"Gao Ming, where have you been?"

"Queen Mother, please take a look."

Too much explanation is useless at all, it is better to release the things and shock the eldest grandson queen.

"Oh, what is this?"

Empress Changsun took the glass bottle in Li Chengqian's hand.

"Just look at it."

"This glass bottle is really exquisite, and it still exudes some fragrance."

Of course, this is a glass bottle for cosmetics, of course, to make it look better.

The essence of useful things is the same, but the appearance of good looks must be packaged.

Just like a domestic product, like Dabao SOD honey, compared with what water abroad, its role will not be worse, and the price is close to the people.

It's not because our things are bad, it's because there are some high-tech and other things abroad, in fact, cosmetics are just like that, and they are inseparable from glycerin.

Of course, some people buy peace of mind.

"Open it and take a look!"

Empress Eldest Sun opened the bottle suspiciously, and a burst of fragrance filled the air.

Inside is a snow-white paste.

"What is this?"

"Erchen calls him body lotion, can the queen mother wipe it on his face and try it?"

Li Chengqian said.

Empress Changsun did not doubt and did so directly.

Her slender corn gently drew the white paste from the bottle and applied it to her face.

"Fragrant, warm!"

These were the first two words that Empress Changsun said.

"The queen mother looked in the mirror."

Empress Changsun took the mirror and looked at it, grabbed the mirror tightly with both hands, and had no intention of going down.

"This body lotion is really easy to use, it makes my face look very hydrated."

"The queen mother's skin is now like that of an eighteen maiden!"

What Li Chengqian said is a real impression, and Empress Changsun is indeed much better-looking.

"This kid is really good at talking!"

Empress Eldest Sun straightened her hair.

O woman, she who pleases herself, no matter which one you are.

"Erchen is telling the truth."

"Well, I'm very satisfied, but this lotion seems to be a little lacking."

"Please rest assured that the queen mother will send some new past every half month."

This vial is enough for her to use for half a month, unless she is in a hurry to use it, if she uses it fiercely, it may not be available for a few days.

"Such a useful thing, I believe it will be popular in Datang!"

Needless to say, it must be true.

Like the soap last time, it also started with a few of their women, and then fried until everyone knew about it, and then it was mass-produced.

This body lotion naturally follows this routine.

"At this time, if you show it to Your Majesty, Your Majesty will definitely be moved again."

"You kid! Who taught you to speak like that! ”

Li Chengqian's words caused Empress Eldest Sun to blush, like a peach blossom.

Li Chengqian laughed dryly, acting a little embarrassed.

At this time, Empress Changsun suddenly asked, "What about your five younger brothers?" I also brought some of their clothes. Let them come and give it a try! ”

Not to mention the eldest grandson queen, she is also here for Li Tai, Li Tai, like Li Chengqian, is her own child.

Anyway, it's not a self-made clothes, you can ask people to make it, the main thing is to get the heart.

"They are studying, so let them come over and say hello to the queen mother."

As soon as Li Chengqian finished speaking, he asked Guan Lishi to find it.

Unexpectedly, after a while, Guan Lishi came and said: "Her Royal Highness the Queen, Her Royal Highness the Prince, it's not good!" The five princes are not in the study! ”

"What!"

Li Chengqian asked fiercely, where will the five brothers go?

These five children are usually within their own control, and it is impossible to get lost.

"This ...... What's going on? ”

Empress Eldest Sun was also puzzled.

It's okay if you don't usually come, but as soon as you come today, these five people are gone.