In fact, Li Changan handed over to Second Uncle Li in the list.

Most of them are very common.

But there is only one fine fabric, which can only be purchased in the largest city of Yunzhou, Lin'an City.

Second Uncle Li had no choice but to send someone to Lin'an City.

It was to buy back the fine fabrics that Li Changan wanted, and this time and again, it naturally took a lot of time.

Inside the inn.

Li Changan looked at the pots and pans in front of him, and smiled helplessly at the corner of his mouth.

At the beginning, he was also a top student who successfully took the doctoral exam.

The experimental equipment used is the kind of tens of millions of sets provided by the school.

But now, he wants to use these simple things to purify the salt.

Li Changan complained helplessly: "Hey, even if you cross over, can't you escape the days of experiments?" ”

Although he complained like this, Li Changan's movements in his hands were not idle at all.

He looked at the pot of coarse salt in front of him, and all kinds of pots and pans, as well as five pieces of cloth of different colors on the side, and immediately took a deep breath.

The steps to purify fine salt slowly come to mind.

Dissolve, precipitate, filter, evaporate, crystallize.

These steps are essential to get a purified fine salt.

For Li Changan, a person with a doctorate degree, purifying opera salt is a piece of cake for him.

But in such a simple environment and equipment, if he wants to purify a fine salt that does not contain impurities, even he is extremely careful and careful.

Li Changan stretched out and grabbed a handful of coarse salt and placed it in a porcelain bowl.

Then he began to pour water into it slowly, and while pouring water, he slowly stirred the salt in the bowl with chopsticks.

Under the stirring of chopsticks, the salt in the porcelain bowl also began to dissolve little by little.

Soon, the salt water inside the porcelain bowl became cloudy.

From this, we can also see how many impurities are contained in these coarse salts?

People in this era use coarse salt for seasoning in a different way than Li Changan.

They don't stir the water when they add it to the coarse salt, so the resulting brine doesn't get too muddy.

After letting it sit for a while, the resulting brine will be clearer.

Then take out the top precipitated brine with a small amount of salt, which is the brine they use to enhance the flavor when cooking.

Such brine not only tastes very bland, but also has no salt taste.

And there must be a lot of impurities in the brine.

Li Changan looked at the bowl of turbid salt water in his hand, observed it for a while, and then put it aside to precipitate.

And the movements of his hands were not idle, and he made four more bowls of turbid salt water according to the steps just now.

In this way, there were five bowls of turbid salt water on the table.

It's a long process.

……

Noon.

The flow of people on the street along the river has rebounded significantly compared to the previous two days.

Li Changan looked at the salt water on the table that was no longer muddy after precipitation, and he felt almost the same.

His gaze immediately turned to the five different fabrics on the other side.

These fabrics have only one function, and that is filtration.

The quality of the fabric varies, and the size of the gap between each piece of fabric varies.

The better the fabric, the smaller the gap between the threads.

The filtration effect will also be better, and vice versa.

The reason why Li Changan prepared so many fabrics.

It is to select the fabrics that are suitable for filtration, and the salt water filtered out of this fine fine fabric can definitely be used.

But the cost of this fine fabric is simply too expensive, far exceeding the value of its fine salt.

In this case, it will definitely not work.

Looking at the five bowls of salt water in front of him, Li Changan used five kinds of fabrics to filter them one by one.

He strained each bowl of brine three times.

And the effect of filtration can be seen at a glance.

The cheapest two fabrics, except for some relatively large particles, are even cleaner than the face.

It's hard to describe how effective the filtration is.

The other two better fabrics can clearly see that a lot of impurities are filtered out.

The most expensive piece of fine cloth also has the most impurities.

Li Changan did not hesitate, even if the two cheapest fabrics were eliminated.

In addition, the filtration effect of the two slightly better fabrics is also about the same.

But it will never achieve the effect of fine fabrics.

Li Changan took the three parts of filtered salt water, walked to the stove in the room, and directly set up the iron pot.

The climate in late autumn is already a little cold.

Most of the homes have also started to burn charcoal for heating.

The iron pot was not large, but it took two quarters of an hour for the salt water in the pot to boil under the charcoal baking.

From beginning to end, Li Changan's hands were always holding chopsticks, stirring in the iron pot.

As the salt water boiled, some white crystals could be seen at the bottom of the iron pot.

These crystals look very delicate.

And they are the fine salts that Li Changan wants to refine.

The water slowly evaporated, and gradually, the brine in the iron pot had become a thick mass.

Li Changan took out a shovel and shoveled out these sticky objects.

It is then placed on the previously filtered cloth and allowed to settle and filter.

During the precipitation process, Li Changan continued to boil the remaining two parts of brine.

The brine, which has become thick, is filtered by secondary precipitation and can be put into an iron pot and stir-fried slowly.

Until the water is thoroughly dry.

After frying dry, Li Changan got some fine salt that looked a little charred.

Stir-fried the three salts, Li Changan spent a whole afternoon.

By the time the third salt was put into the bowl, the sun had already begun to sink in the sky.

Li Changan looked at the three parts of burnt black fine salt in the porcelain bowl, and the corners of his mouth finally showed a satisfied smile.

The hard work paid off, and after a busy day, he finally got these three small bowls of fine salt.

Li Changan immediately came to the kitchen of the inn excitedly.

At the moment, everyone is busy with their own affairs.

But soon, someone discovered Li Changan's figure.

I saw that the owner of the house actually came to the kitchen, which was full of oil.

Everyone's faces looked a little surprised, and after a while, a young man in his twenties walked up to Li Changan.

He asked with a panicked expression, "Master, why are you here?" ”

"If you want to eat something, just ask your subordinates to give you orders."

"We'll send it to you when it's ready." The young man's tone was full of unease.

Li Changan raised his hand to interrupt him.

Then he pointed to the three servings of fine salt on the table next to him, and said, "Who is the best cook among you?" ”

"Use the contents of these three bowls to fry three plates of the same dish for me."