The extraction and redistillation of glycerin is a meticulous work, and Yang Dewen did these simple experiments in the chemistry laboratory class when he was in school.

Yang Dewen, who was from a poor family at that time, saw many historical travel novels, after the travelers traveled through the past one by one, they were all poor and couldn't live at the beginning.

But at the beginning, after making soap, soap or something, it was really counting the money to the point of hand cramps, and all the beauties took the initiative to give them a hug.

At that time, Yang Dewen was actually very envious of these traversers, and he had fantasized countless times, if he also traveled into history, would it be the same? Will it be very nourishing?

It turns out that he can really live a very good life, but he is not as shameless as those people, so although he has a beautiful daughter-in-law, who is by his side, there is another, no, it is several female slaves bought by himself.

But Yang Dewen sadly found that he was still a boy without ***.

The extraction and distillation of glycerin must be done by himself, but Yang Dewen is of course unwilling to do the rough work of boiling oil to make soap and soap.

After Yang Dewen and Yurong discussed, he asked the second grandfather to recommend a few more honest and reliable villagers to teach them how to make soap.

In fact, Yang Devon is not worried that they will start their own after they learn how to make soap.

Because the seemingly simple soap-making process, the most important thing is to use caustic soda, which is very burning, and if it accidentally splashes on the skin, the damage to the skin is no worse than sulfuric acid.

For this kind of high-risk raw materials, Yang Dewen will certainly not let people touch it casually.

Of course, the extraction of caustic soda is also very simple, you only need to add lime powder to dissolve in water, and then add some baking soda powder to obtain caustic soda.

Although due to the limited conditions, the extracted caustic soda will not be very pure, but it does not matter, as long as it is poured into the pot, it is enough to produce a saponification reaction, at most it is just a large amount of poured in.

To put it simply, the person in charge of making soap is just to pour the caustic soda prepared in advance by Yang Dewen into the boiling oil nest according to the proportion prepared in advance, and keep stirring vigorously to ensure that the saponification process is uniform.

After the saponification is completed, the solidified saponification part will be scooped out with a large spoon. It is placed in a large wooden barrel and mixed with some essential oils extracted from flowers and fruits.

After stirring again, pour it into a mold that has been ordered, cool and form, and it becomes soap.

As for the essential oils of flowers and fruits, of course, they are also mastered by Yang Dewen himself.

If someone really makes their own soap, but if they don't add the essential oils of these flowers and fruits, the soap will have a strong taste of lard, or other animal oils, and I believe that no one will want to use such soap.

After the soap is made, what remains in the pot is incomplete saponification.

Of course, you can continue to add caustic soda and then continue to stir it, but if this part is made into soap, the effect is not good.

Therefore, Yang Dewen did not intend to add caustic soda, but separated this part of the very turbid substance that was not completely saponified, added brine, poured it into a simple mold made of bamboo slips, buried it in cotton thread, and let it cool down by itself, so that it became a candle that could be illuminated.

These lard wax, or sheep fat and other wax, compared with the market for sale, ordinary paraffin, insect wax, the effect is better than just a little, both bright lighting, less oil smoke characteristics, compared with the top grade butter wax, the gap can be negligible.

However, butter wax is almost invisible in the market. In this world, cattle are very important strategic materials.

It can be said that in this world, killing a cow is much more serious than killing a slave.

Even if it is an old cow, it can basically only wait for it to die of old age, some cattle on the long mountain that have broken their legs, if you want to kill it, you must report to the government, and the government will send someone to confirm whether the cow can be killed, only with the approval of the government, you can kill the cow.

Therefore, Zhou Xingxing has not eaten beef for a long time, and the wax made of butter can basically only be used occasionally in the palace and in the palaces of various kings.

And that's only occasionally. Every day with butter and wax, it is impossible in the palace.

The remaining waste liquid exudes a foul smell, and these are the treasures that Yang Dewen really likes, because glycerin is purified from these waste liquids.

It may seem incredible, but it's just the way it is.

As long as the remaining waste liquid is simply filtered, a water-like substance containing glycerin can be obtained.

Glycerin has a higher boiling point than water, and as long as you heat it to 100 degrees, the water will automatically evaporate, and what is left is pure glycerin.

Of course, due to the constraints of conditions, the so-called pure glycerin is only relatively speaking, and it is definitely inferior to the pure glycerin produced industrially in later generations.

But so what? Yang Dewen has no hope at all that he can make 100% pure glycerin. As long as he can purify the fruit wine and decompose a substance called Ganning in the fruit wine, his goal will be achieved.

Yang Dewen had also made some soap before, in addition to his own use, Qin Xiaotian had left some of it, and even Miss Tong in the VIP building, Yang Dewen had not sent it yet.

There are still some in the leisurely Curie, but those don't matter if you use them yourself, and they don't look good if you sell them.

Because at the beginning, Yang Dewen simply wanted to extract some glycerin and use it to purify fruit wine, and soap became some incidental products for Yang Dewen.

However, since large-scale production is being prepared, it is definitely impossible to keep all those soaps for their own use.

So this time to make soap, Zhou Xingxing also put in a lot of hard work, he asked the Muchen to create wooden boxes one by one, and at the same time, like a pottery workshop, ordered a batch of molds to shape the soap.

The soap was in a wooden box with a lot of small holes drilled in the bottom of the box, and it was going to buy paint. Very high-end and high-grade.

One day, when the old customers walked through the door of the leisurely house, they found that a notice was posted at the door of the store, and the store will start at the beginning of next month, and will no longer sell all kinds of rai, but only keep selling all kinds of fruit wine.

In addition, the store will open from the first day of the next month, and there will be no limit to the number of sales of various fruit wines, and in principle, customers are allowed to buy as much as they want as long as the store has stock.

When a regular customer walked into the store, he suddenly found that some tables and chairs had disappeared in the leisurely hall, and a new row of counters had been installed.