(Ask for collections, ask for recommendation votes!) ）

Ning Xiu swallowed and spitted at the mouth, "Dad, just wait." My son can guarantee that what he made this time will definitely sell better than finger cakes. ”

"That's pretty much it!"

Ning Liang scolded with a smile: "Is there anything you need your father's help with?" ”

Ning Xiu shook his head again and again: "How dare you bother your father, you just wait to count the money until you are soft." ”

After Ning Liang left, Ning Xiu called the two cousins and gave them some orders.

"Shichiro, go and bring the big wooden barrel from the stove to the courtyard. Juro, go to the yard and fetch some water, and pour it all into a big wooden barrel. ”

Qilang Ning Yi looked puzzled and said, "Third brother, do you want to bathe?" But I'm afraid it's not good to bathe in the courtyard in broad daylight. If you let your aunt see ......"

Ning Xiu almost turned his back on his back.

"What do you think, third brother, I don't want to bathe."

Shilang sighed and said, "Since the third brother doesn't bathe, what do you want to do with a big wooden barrel?" I need to draw so much water from the well. ”

Ning Xiu really wanted to cry without tears.

"You just do it, and I'll take care of the rest."

Shichiro and Shiro glanced at each other, nodded and said, "What the third brother said is that we will go here." ”

Ning Xiu was not idle, he took three catties of alkaline noodles and two catties of quicklime and walked towards the courtyard in a hurry.

Seeing that Qilang and Shiro had already made preparations, Ning Xiu nodded with satisfaction and said, "Later, you will stay away, don't be burned." ”

Shichiro was surprised: "This is cold water, how can it be scalded?" ”

Ning Xiu smiled and said, "You'll find out later." ”

As a doctoral student in chemical engineering, Ning Xiu's theoretical knowledge reserve is very complete, as long as he is given enough resources, he can make many chemical products.

But the problem is that with the industrial production capacity of the Ming Dynasty, it cannot hold up many ideas.

Right now, the most lucrative thing Ning Xiu could think of was soap.

Yes, it's the most popular thing for the traveler - soap.

Soap is relatively simple to make, but the benefits are considerable, making it the most suitable thing to make at the moment.

The core step in making soap is saponification, which is mixed with caustic soda solution and grease to salt out a viscous liquid, which is dried to make soap.

But before that, caustic soda must be obtained first.

Caustic soda, also known as sodium hydroxide, is not naturally occurring and must be obtained through chemical reactions.

The simplest way is to react with hydrated lime and soda ash to precipitate calcium carbonate and sodium hydroxide.

Alkaline noodles, that is, soda ash, are now available, and what Ning Xiu has to do now is to get hydrated lime.

He carefully poured two catties of quicklime into the wooden barrel, and the otherwise calm water immediately made a sizzling sound. Quicklime calcium oxide meets water to form calcium hydroxide, which releases a large amount of heat.

Seeing a rolling heat wave rising above the barrel, Ning Xiu subconsciously took a step back.

This is also the reason why he asked Shichiro and Shiro to stay away.

The quicklime dissipates heat too quickly and quickly when exposed to water, and it would not be good if Shichiro and Juro were burned in curiosity.

Ning Xiu waited quietly for the reaction to be complete, and then poured three catties of alkaline noodles into the barrel along the edge of the barrel.

This step is to obtain a sodium hydroxide solution.

Calcium hydroxide meets sodium carbonate to react to generate calcium carbonate precipitate and sodium hydroxide solution, what Ning Xiu has to do is to wait until the calcium carbonate is completely precipitated to filter out the sodium hydroxide solution.

This process requires patience, Ning Xiu waited until the upper solution was absolutely clear before straining out the solution with a large spoon and pouring it into a small wooden barrel.

Shichiro and Shiro on the side looked stupid. Where had they ever seen such a scene, it was like a trick.

The third brother is a scholar in the end, but he is not ordinary.

With the caustic soda solution, the saponification reaction can be carried out.

But only if there is enough grease for the reaction.

This is also the reason why Ning Xiu went to the third uncle to collect minced meat and bones.

Theoretically, both animal and vegetable oils can be saponified.

But those who have a little experience in the chemical industry know that it is difficult to make soap from vegetable oil.

Animal fats and fats, on the other hand, are relatively easier to form.

This is also the reason why Ning Xiu did not choose ready-made vegetable oil like other traversers, but took the trouble to find animal oil.

Because it is professional, the soap texture will be good. Strictly speaking, the soap made by those who traveled from vegetable oil could not even be called soap, but a lump of soft soap cream.

However, there is one more step to use animal fat, and now what Ning Xiu has to do is to purify animal fat.

The reason why he didn't use a whole piece of meat was to save money.

A small cart of bones and minced meat collected from the third uncle only cost ten taels of silver, which was enough to support him to make tens of thousands of pieces of soap.

"Shichiro, Shiro, come with me."

Ning Xiu led the two to the stove room, pointed to the bones and meat, and said, "Put these in the pot." Pour a little more water and boil. ”

I had just witnessed the magic, and now Shiro and Shiro were obedient to Ning Xiu.

Shichiro threw the firewood into the stove, lit it, and poked it with a latte tong to ensure that the fire was strong.

Juro threw the minced meat and bones into the pot and poured in a little water.

In Ning Xiu's previous life, he used this soil method to purify the oil, so he was full of confidence.

I have to say that the bones and minced meat given by the third uncle are still very material.

After less than half an hour of cooking, a thick layer of grease floats on the surface.

Ning Xiu personally used a spoon to strain out the grease and put it in a small wooden barrel.

He gave a demonstration, and the next task was naturally handed over to Shiro and Shiro.

The process of extracting animal fat from bones and minced meat is not very technical, but it is tedious and time-consuming. Ning Xiu's time is precious, so it is naturally impossible to spend all his time on this, so he plans to train Qilang and Shiro to be his right-hand men and complete these tasks in his place.

When the pot full of grease was filtered out, Ning Xiu asked Shiro and Shiro to bring the wooden barrel containing the caustic soda solution in the yard.

"Next, third brother, I'm going to surprise you."

At this time, the iron pot had been cleaned up, Ning Xiu rubbed his palms, first picked up the wooden barrel and carefully poured the caustic soda solution into it, and then poured the filtered animal fat into the caustic soda solution.

"Shichiro, quick! Fetch a stick. ”

Ning Yi hurriedly handed over a wooden stick, and after Ning Xiu took it, he poked the wooden stick into the pot and stirred it.

Animal fats and fats have better hydrolysis and separation effects than vegetable oils, but they must be stirred constantly to have the best effect.

Of course, heating is indispensable in the process of saponification reaction. Shichiro and Juro kept adding firewood and probing with iron tongs to keep the fire alive.

Gradually, the grease in the iron pan disappeared and was replaced by a viscous yellow-brown liquid.

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