It's hard for my elder sister. I rely on the mountains to farm and pay off my debts.

Seeing that it was still early, Song Zhi went to the meat market again to buy ingredients for tomorrow.

The meat stall owner had already remembered Song Zhi and began to greet her warmly when he saw her from afar.

The stall owner was very honest in his business, and Song Zhi was happy to continue to take care of his business. "Do you have any pig lungs or pig hearts today?"

The stall owner nodded repeatedly, "Yes, yes, not only these, but also pig intestines are still available."

The butcher had obviously remembered this customer who liked to buy pig offal.

Song Zhi nodded, "Please weigh them for me, I want them all!"

The butcher quickly sighed, and while he was swiftly weighing the meat, he was trying to sell it to Song Zhi.

"Sir, do you want anything else? Today's pork belly is mostly fat, with less lean meat. Would you like some?"

Song Zhi took a look at the big white fat meat on the butcher counter and couldn't help shaking. If it were in modern times, she would never buy this kind of meat.

But thinking of her skinny family, she nodded and said, "Give me a knife too."

Out of the corner of her eye, she caught a glimpse of a large piece of lard on the chopping board, and Song Zhi suddenly remembered the mugwort leaves she had carried back from Doctor Zheng's house yesterday.

It just so happens that mugwort has the effects of antibacterial disinfection, dehumidification and antipruritic. The soap made from mugwort can not only remove dirt, but also relieve eczema, skin itching and other problems.

If I make a mugwort soap with mugwort leaves, I shouldn't have any trouble selling it in this county town full of merchants, right?

Moreover, this mugwort soap is small in size and easy to transport, making it the best product for all merchants to make profits.

The more Song Zhi thought about it, the more she felt that this product had great potential.

It just so happened that her cashmere products had not been developed so quickly, so it seemed like a good idea to promote herself with handmade soap before that.

Moreover, she has less than a hundred taels of silver in her hand now, but most of it will definitely be spent on building the house this time. If she wants to send a few children to school later, it will cost a lot of money.

And now she is also studying herbal medicine with Dr. Zheng. As long as she can explain why she thought of using lard to make soap, this matter can be explained.

Song Zhi's brain was working at high speed, thinking about the time when she searched the history of soap development in order to make a short video about soap making.

In fact, as early as the Western Jin Dynasty, aristocratic families began to use pig pancreas to make cleaning products.

They grind pig pancreas into a paste, add soy flour and various medicinal powders, and then make small balls or powdered products.

This simple method effectively removes dirt and oil, leaving your skin feeling fresh and clean.

As time went by, in modern times, people discovered that wood ash also has a good cleaning effect.

When wood ash is dissolved in water, it becomes weakly alkaline and can react with oils to form soap bases.

This soap base not only enhances the cleaning ability of pig pancreas soap, but also moisturizes the skin, making it smooth and delicate.

In modern times, people have made further improvements to the production process of pig pancreas soap.

They would add ingredients such as rice milk, baking soda and soybean powder to pig pancreas to make pig pancreas soap closer to the modern formula.

In this way, the appearance and feel of pig pancreas soap have been greatly improved, making it more convenient and comfortable to use.

Thinking of this, Song Zhi's eyes involuntarily fell on the pork chopping board.

She suppressed her excitement and said slowly, "Stall owner, can you weigh me another piece of pork fat? And can you sell me that pig pancreas as well?"

The butcher at the meat counter was completely confused. Why did this young lady buy these things that no one wanted?

However, this did not prevent the butcher from being happy.

Seeing that Song Zhi had bought so many things, the butcher wanted to make friends with her and said generously, "Since you want it, I'll give you this pig pancreas. Please take care of our business next time."

Song Zhi smiled and nodded, "Thank you very much, stall owner!"

After paying the money, Song Zhi did not stay in the city any longer. She took her things and went straight out of the city and returned home.

Song Zhi returned to the kitchen with her hands full of food. When Mrs. Wu saw her, she hurried forward with a wooden basin.

Song Zhi placed the entrails in her right hand into the wooden basin and said to Wu, "This is for making stew tomorrow. Grandma, please help clean it out in the afternoon."

Mrs. Wu had tasted the braised pork and thought it tasted quite good.

Hearing her granddaughter's words, Mrs. Wu immediately agreed. Seeing the lard in her granddaughter's left hand, she asked again, "We still have half a pot of lard at home. Why did you buy more?"

Song Zhi couldn't possibly say it was for making soap. She cleverly said, "I saw people eating sauerkraut and oil-dregs buns in the city today. I want to eat some too!"

It was rare for Mrs. Wu to hear such coquettish words from her eldest granddaughter.

No matter how mature he is these days, he is still a child after all, and he will be greedy when he sees something delicious.

She said cheerfully, "Okay, okay, grandma will make you some fried buns tonight."

"Then I'll help you boil the oil later!" After saying that, he took a wooden basin, turned around and ran away.

As for making pig pancreas soap, let's talk about it after I come back from Doctor Zheng this afternoon.