There are three main raw materials used in the manufacture of soap, animal fat, flavoring agent and caustic soda. The first two raw materials are easily obtained, and the difficulty lies in the preparation of caustic soda.

There is an inexhaustible supply of natural soda ash in the soap salt lake, which is one of the raw materials for the preparation of caustic soda, and one more raw material is hydrated lime. Since limestone is abundant and easy to mine, hydrated lime is not difficult to obtain.

The specific process is to heat limestone (calcium carbonate) to obtain quicklime (calcium oxide), and then add water to quicklime to obtain hydrated lime (calcium bicarbonate). Hydrated lime + trona (sodium carbonate) can be used to make caustic soda; Caustic soda is mixed with oil and oil for saponification reaction to produce soap, and finally some spices are added to make soap.

On Earth, an average high school student can use the chemistry knowledge learned in the classroom to make his own handmade soap, but in Vares, where chemistry - or "alchemy" - is not popular, Roland spent a lot of saliva explaining the chemical reaction, and finally failed to make Anthony, Semyon, and Lyudmila understand what he was talking about, staring at him with a blank face......

Seeing their inexplicable expressions, Roland was also very tired and lost the desire to continue communicating.

Fortunately, at this time, a professional who could communicate smoothly with him came - Jack teleported over with the newly completed mercury mirror.

"Yo, Jack, it's just in time!" Roland took the square glass plate from the dwarf alchemist, handed it to Lyudmila without looking at it, and pulled Jack to talk excitedly about the "saponification reaction", and finally found someone who understood.

Lyudmila picked up the square mirror with one hand and looked at it, the back was silvery-gray, the tin and mercury fused so tightly that it was almost impossible to fall off, and the front of the glass showed a smooth mirror surface, reflecting better than she expected, clearly reflecting her face.

Lyudmila looked in the mirror, pulled a comb out of the storage bag, and was about to comb her hair, when Anthony impatiently leaned over and waved his hand to release an arcane art.

The mirror surface was illuminated by "detection magic" and did not reflect the slightest magic aura, which shows that the mirror in Lyudmila's hand has not been enchanted, which proves that the new process proposed by Roland is indeed feasible and has immeasurable commercial value!

While Lyudmila, Anthony, and Semyon were marveling around the "mercury mirror," Roland was introducing Jack to the idea of making soap from limestone and natural soda ash as the main raw materials, supplemented by oils and spices.

"Mr. Roland's idea is very interesting, I will collect some trona and limestone by the lake and take them back to the laboratory, and try to refine that ...... according to the method you said."

"Soap."

"Yes, soap." Jack patted his head, "If this thing does have a strong stain-removing effect, my assistants will definitely like it, and it will be much easier to clean the lab equipment later." ”

The young dwarf alchemist was not surprised that Roland had invented the mercury mirror and soap. Ever since Roland inspired him to improve the "Fireball Potion" and invent the "Magic Guide Proximity Fuze", Jack has decided that Roland has an extraordinary talent for alchemy, but unfortunately he has been delayed by various trivial matters and has not been able to make full use of his talents in this field.

Compared to inventions of great military value such as grenades, grenadiers, and magic proximity fuses, Mr. Jack did not think that things like mercury mirrors and soap were of great military importance, nor were they interested in wasting energy on them. So when Roland asked him to be a technical consultant for the soap factory and the mirror factory, he deduced with a difficult face that the ordnance factory still had a lot of work, and he didn't have time to toss around these trivial matters.

"If there is no more suitable candidate for Monsieur Roland, it would be better to ask my uncle for this position, who is lonely alone in the town of Big Rabbit's Nest, and who wrote not long ago to ask me how I am doing, and how I am going to close the shop and move in with me."

"It would be great if Mr. Duvalin would come!"

As far as the entire Far East is concerned, Duvalin's position in the alchemist industry is equivalent to the status of the old man Sukhoi in the machine warlock industry, if this quasi-legendary alchemist can be invited to sit in the industrial zone, not only the soap factory, the mirror factory and the instrument factory will directly benefit, but other factories can ask his old man for advice if there are problems involving materials and processes, which will be of great benefit to the overall technological progress of the industrial zone.

Roland, of course, will not let Master Duvalin work in vain, in addition to taking a consultant's salary, he also intends to give him some shares. Just as he was about to discuss with Jack about the treatment of Master Duvalin, Anthony couldn't wait to run over with the mercury mirror in his hand, and his eyebrows fluttered.

"We're really going to be developed this time!"

Roland smiled lightly, "It seems that you have a high opinion of my mirror-making process?" ”

"High, really high, in my opinion, this is the most important and practical invention of the year!" Anthony gave a thumbs up and didn't hesitate to praise it.

He was very satisfied with the quality of the mercury mirror, and he was also full of expectations for what Roland called the "soap" process, hoping that "the most important and practical invention of the year" would be added to a "tie for first place".

"If soap is as good as you claim, and if it has the wonderful effect of removing odors and refreshing the mind, I would be happy to invest in it." Anthony wanted to speak and stopped, first looked left and right, leaned into Roland's ear and lowered his voice and said: "I have a way to bypass the blockade, sell mercury mirrors and soap to the territory of the empire, and make a lot of money in the luxury market!" ”

Roland couldn't help laughing: "I brought you to the industrial zone to give you the opportunity to negotiate accounting business, you are good, you don't do anything but want to engage in smuggling." ”

Anthony rolled his eyes and said confidently: "It doesn't matter which line of business you do, what matters is which line of business is more profitable, besides, what others do is smuggling, and what I do is legal trade." ”

"Isn't it stressful to be friends with this kind of broad?" Lyudmila was a little sympathetic to Roland, "Will there be an urge to punch him at any time to break the bridge of his nose?" ”

"More or less a little." Roland couldn't help but laugh.

"It's too much! One of you is a dignified prince, the other is a future prince and concubine, and I am just a hard-working young man with no inheritance from a merchant family, how can you have the pressure on me! Anthony shouted aggrieved.

"That's right, it looks like I'm wrong about you." Lyudmila rarely expressed sympathy for Anthony, mainly because the title of "princess" made her feel good.

Jack hurriedly teleported Roland's soap recipe back, and before he could start experimenting, he had to write a letter to his uncle to convey Roland's kind invitation.

Roland had to make preparations before the arrival of Master Duvalin, and invested in the mirror factory and the soap factory in the name of the "Kolas Family Fund", holding 60% of the shares, and leaving 40% of the shares, first of which was distributed to Duvalin as a remuneration for technical guidance, and the other 30% was to invite Lyudmila, Anthony and Semyon to participate in the shares.