Li Li introduced the formula of the new specialty of Poyang - blue and black ink.

However, the formula is quite simple, not as complicated as outsiders imagine, and there is no need to keep it confidential.

"The reason why the formula is not confidential is that the formula is extremely simple, and the other is that the character of the ink changes color over time, which cannot be imitated at all."

After Li Li finished speaking, he brought a cup of tea and let the king first? Look, the tea is light yellow.

Then, he poured some powder from the porcelain bottle on the paper. The powder was green. When Wang saw it, he blurted out: "One of the raw materials for preparing ink is green powder, is it..."

"That's right, please see the commander." After Li Li finished speaking, he poured the green powder into the teacup. Wang? He looked closely and found that the tea in the teacup had slightly turned black.

Wang? said in surprise: "This, this is..."

Li Li replied: "This is a chemical reaction... The so-called chemistry, the commander can use it as an nickname for alchemy."

"So you are proficient in alchemy?" After Wang said that, he was shocked to have a slight tongue. Just as he was embarrassed, Li Li smiled and said, "Haha, I don't practice immortality, what's the use of learning this alchemy?"

Wang? Smiled dryly, and returned to his seat, Li Li continued to explain: "The commander must know that there is copper water in Le'an, Poyang, Raozhou, and its water is blue."

Wang? nodded, and Li Li continued: "The craftsman uses the method of gut copper to take copper from the water. The method is very simple, which is to immerse the iron sheets in the blue water. Gradually, the copper will gather on it."

Wang? I heard about this magical method of gallbladder and copper, and I heard Li Li say: "The method of gallbladder and copper is used as a product, and its accompanying organisms is a by-product."

"This by-product is green, that is, green alum."

"Now, Le'an water copper production has exceeded 2 million kilograms per year. This is a positive product, and the by-product, that is, this green alum, has a high output."

Wang? Asked: "I heard that green alum is also a common medicine for alchemy?"

"Yes, but it's really a waste of resources to use so much green alum to refine elixirs." Li Li signaled his servant to come over and poured out the color-changing tea. He picked up the small porcelain bottle again.

"As the commander saw, green alum and tea mixed together will change with a certain component in the tea and appear black. This principle is the principle of ink making."

"The ingredient tea is currently called 'tannin'."

"Of course, the real ink raw materials are green alum, and the other is not tea powder, but tannin powder, so the real ink can be made."

"But the color is lighter, so blue pigment needs to be added appropriately."

"Then, how to make tannic acid? Do you make tea leaves?" Wang? I'm really curious.

"This is a solution, but it's not cost-effective." Li Li shook his head, "Tanning acid can tannate leather, but I haven't seen anyone use tea to tannate leather because the tea has low tannin content."

"The craftsmen in Poyang have figured out the use of green alum obtained by the copper gallbladder method. Through continuous experiments, they found that using the juice of certain plants can also produce changes similar to that of tea and green alum."

"For example, the common medicine, Jubili, is called red salt fruit in Jiangzhou, or dogwood, which is a common plant in the mountains, with small red fruits growing in grains."

"Using these two plants, through some processing, tannin can be prepared, and combined with green alum powder, and can turn into blue ink."

"The tannic acid component in this ink will deteriorate over time and turn black after contact with air."

"So that's it." Wang? nodded and was very happy: Now, the strange knowledge has increased again!

Li Li put the porcelain bottle down and smiled and said, "Le'an extracted water copper, and a large amount of green alum is produced. Nowadays, blue and black ink is of high quality and cheapness, and is very popular. Le'an has another money-making specialty, which is really a joy."

"There are many dogwoods and five-fold birds in Jiangzhou. In this way, picking raw materials can also give many people a source of income."

Wang? sighed: "I am the original principle of this blue-black ink...the principle is completely different from that of commonly used ink. It is easy to prepare and the raw materials are also easy to carry."

Li Li nodded: "Yes, this is the charm of chemistry, endless."

"Why did the envoy call alchemy chemistry?"

"Don't be surprised by personal hobbies."

Wang? After several years of contact, I felt that Li Li was indeed different. I originally wanted to ask some things, but it was not easy to disturb him for too long and I quickly retired.

Li Li looked at the pile of official documents and the blue and black handwriting in the official documents, and felt quite touched.

The ingredient of green alum is ferrous sulfate. Ferrous sulfate is useful for many purposes, such as planting flowers as flower fertilizer to ensure that the leaves in pots do not turn yellow.

Once upon a time, when the pen was still large, middle school students were writing stationery, the blue and black ink accompanied by countless people's memory of the students' time.

Blue-black ink, also known as iron tannin, is the principle that ferrous sulfate meets tannin, forming the compound ferrous tannin.

The ferrous tannin sealed in the bottle will not change because it does not come into contact with oxygen.

After writing on paper, it comes into contact with oxygen in the air and is oxidized to iron tannin, so the handwriting will turn black.

This has the characteristic that the writings written in blue and black ink will change color over time.

Therefore, blue and black ink has become the era of paper archives, and ink is often used when writing archives.

Blue-black ink (tannin iron tannin) has a long history. It is said that in Europe began to use this ink in the Middle Ages, with a lighter color. Later, people added blue dye to "add blue" to it.

When the fountain pen was replaced by a water-based pen and gradually faded out of people's sight, blue and black ink became "rare".

However, the "standardness" of high-end fountain pens has always been there, so for those "pen players", the high-end fountain pens they carefully collect must be equipped with excellent blue and black ink.

He learned about the relevant knowledge by chatting with others.

In modern times, little knowledge that is basically useless, now comes in great use.

Poyang Le'an produces a large amount of "water copper". The by-product green alum is also produced very large, but it was not very useful at the beginning, and it was equivalent to waste.

As the blue and black ink sales opened, green alum instantly changed from a useless rib to a chicken wing.

Why not become chicken legs?

Because other important uses of green alum are the key to turning it from a useless rib into a chicken leg.

For example, when the air is isolated from the smoldering of green alum, its gas is corrosive, can damage the fabric, dissolve in water, obtain "green alum oil", and is also corrosive.

Alchemists have long discovered this point, so green alum is a commonly used raw material for alchemy.

So, what compound is green alum oil? Li Li thinks it is necessary to figure it out.

The gas generated by green alum heating at high temperature is corrosive. The solution dissolved in water is either a strong acid or a strong alkali.

Li Li didn't remember much chemical knowledge. After thinking about it, based on the known condition that the composition of green alum is ferrous sulfate, it is then deduced that the gases produced by thermal decomposition of green alum should be sulfur dioxide and sulfur trioxide.

Dissolved in water means sulfuric acid with a lower concentration.

Therefore, "green alum oil" is dilute sulfuric acid.

Then, a large amount of green alum can produce relatively high concentrations of sulfur dioxide and sulfur trioxide gases. When dissolved in water, it can become sulfuric acid with relatively high concentrations.

With sulfuric acid, even though it is not concentrated sulfuric acid, many problems are still solved.

Therefore, the biggest reason why green alum is used to transform into chicken legs by refining the by-product of water copper in Poyang Le'an, Poyang in Raozhou. Sulfuric acid can be produced on a large scale.

With sulfuric acid (not concentrated sulfuric acid), many chemical tests can be conducted with strong purpose.

Technicians can use scientific rather than alchemy thinking to produce sulfuric acid through the earthly method and sodium hydroxide acid and other acids and alkalis to try to produce more compounds.

Try to improve various processes through chemical methods.

This is the result of the efforts of countless people, which made Li Li feel the collective power.

This power is inspiring.

The dark power struggle in Jiankang City gave Li Li the feeling of dark clouds covering the sun and storms.

And the vitality of all industries in Poyang that flourishes is the sunny sunny day.

Many years ago, he planted many seeds of hope and worked hard to water it with more and more people. Now, the seeds have grown into trees and finally started to bear fruit.
Chapter completed!