Li Zhi sat in Fanjiazhuang's chemistry lab, manipulating the sulfuric acid reagent and seaweed ash in his hands. Pen & Fun & Pavilion www.biquge.info

He poured sulfuric acid and seaweed ash into a glass and put the glass tube on top of it. Soon, a puff of blue-purple gas rose from the ashes of the seaweed.

This blue-purple gas is the gaseous form of iodine: sulfuric acid meets the alkali metal iodides contained in seaweed ash, potassium iodide and sodium iodide, to form hydrogen iodide. It reacts with sulfuric acid to produce free iodine.

As the reaction progressed, more and more iodine vapor was in the glass test tube. Finally, at the other end of the glass test tube, more and more iodine crystals condensed on a cup that was externally cooled by cold water. The purple iodine crystals stick to the bottom of the clear glass, which looks very good.

The method used by Li Zhi is the same method used by Courtois when iodine was first discovered in 1811. This method is simple to operate, easy to obtain, and although it cannot produce iodine in large quantities, it is very convenient for obtaining iodine in small quantities.

Li Zhi continued to react with sulfuric acid and seaweed ash, and finally obtained a small cup of iodine crystals.

Li Zhi prepares iodine because he uses iodine steaming to obtain fingerprints on paper and skin. This method of criminal investigation only appeared in the twentieth century, but Li Zhi was now faced with the need for detectives in the steel town factory case, so he decided to invent this method in advance.

Once the iodine crystals are made, it is simple to extract the fingerprints. Li Zhi pressed his fingerprint on a banknote, and then moved the banknote to a large glass jar to fix it, heating the iodine crystals at the bottom of the jar.

Soon, yellow-brown fingerprints appeared on the banknotes. This is caused by the reaction of iodine crystals and oils in fingerprints.

Li Zhi took out the banknote and covered it with a piece of white paper coated with fish glue on top of the fingerprint, and with a light press, the fingerprint was fixed on the white paper. At this time, the fingerprint is azure blue, and its shape is reversed by 180 degrees from the original shape.

Li Zhi pressed his left hand with his right index finger again, and then put his left hand into the jar with rich iodine vapor and tried it, and sure enough, a yellow-brown fingerprint was also reflected on his left hand. Li Zhi pressed the white paper of fish gelatin on his left hand, and also obtained a fingerprint of his right index finger.

Li Zhi compared the fingerprints obtained by the two methods.

The fingerprint matches exactly, and it can be determined that it is the fingerprint of the same finger.

Li Zhi smiled and blew out the alcohol lamp that heated the glass jar.

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Cui He sat in the backyard of the Guogong Mansion and looked at Cui Changwu with a gloomy face.

Cui He bit his lip and said, "Second brother, I came to you today to discuss the case of Steel Town with you. ”

Cui Changwu frowned and said, "Sister, this case can't be investigated." ”

Cui He asked, "How can I not find out?" ”

Cui Changwu said: "The Li family is loyal to Grandpa Guo and is the pillar of Grandpa Guo. Grandpa Guo will not do anything that harms the interests of the Li family easily. Now the case in Steel Town is confusing, and there is still no conclusion on who caused the collapse of the factory, and all the parties involved are dead or fleeing, which can be said to be dead without proof. ”

"Since the parties involved have been lost, how can other evidence not be destroyed? There is no doubt that there is no evidence to be found in this case. If you press Li Zhenpin and Li Yousheng too hard, you will offend the Li family. When the Li family comes back, maybe Grandpa Guo will punish me. ”

"No matter how you look at it, this case is the result of nothing. The last time I punished Li Xing, I already offended Li Xing. If I go to check on Li Yousheng again this time, the Li family will definitely say that I am making things difficult for the Li family, and it will be really impossible to say when the time comes. ”

Cui He listened to Cui Changwu's words, biting his lip and not speaking.

After a long time, Cui Hecai said: "Second brother, I know that what you are doing is a thankless task. It's just that if there is no one to govern the Li family, your brother-in-law's high-ranking official Houlu One Town and Four Provinces may not be a blessed land, but a life-threatening talisman. ”

Cui Changwu was stunned, and looked at Cui He without speaking.

Cui He said: "Second brother, your brother-in-law looks beautiful, and people say that he is under one person and above ten thousand. But in fact, your brother-in-law is fighting the gangsters and traitors in the whole world with the power of one person. He killed Tartars, corrupt officials, Hongyi, and thieves, and killed people's heads, looking majestic, but in fact, he was walking on thin ice. ”

"Your brother-in-law is a one-man man who wants to change this country."

"Those officials in the court hate your brother-in-law like a murderer of your father, and they can't wait to skin him and eat his flesh. Those gentry in Jiangnan were even more fierce, and they directly formed an army to crusade against him at any time. ”

"Although your brother-in-law has tens of thousands of elite soldiers, the reason why these soldiers and horses can stop those traitors is because one town and four provinces are of the same heart."

Cui He cried as he spoke, tears streaming down his cheeks.

"However, the interior of one town and four provinces is not peaceful, and your brother-in-law works hard every day, and he can't stop some people from being corrupt and perverting the law. The Li family is all the veterans of your brother-in-law's career, as you said, these people cannot be easily punished without conclusive evidence of their crimes, otherwise all bureaucrats will be chilled. Your brother-in-law has so many enemies, and if the internal bureaucrats are dissatisfied, they will make mistakes and cause chaos, and they will not have the strength to fight against the enemies outside. ”

"But if you don't stand up for your brother-in-law this time, and don't help your brother-in-law take down the traitor, one town and four provinces will be even more chaotic."

Cui He wiped his tears and said: "More than 30 people were stoned to death this time, if such a big case is not solved, then who will know the law in the future?" The Li family, the Zheng family, and the petty bureaucrats below are afraid that they will all be corrupt. ”

"If this head is opened, no one will take care of such a big case, which one will be able to stop this trend in the future? In one year, two years, or ten years, there will be as many corrupt officials in Tianjin as in other parts of the Ming Dynasty. ”

"Your brother-in-law's career will be inherited by Li Huan in the future. However, 30 years later, if there were corrupt officials all over Tianjin, everyone would form a party for personal gain. So where can Li Huan still govern the territory? All the money was sucked away by these corrupt officials! Without silver to support the army, what did Li Huan take to fight the gentry? ”

"Your brother-in-law has disobeyed the holy decree in order to fight with these traitors. The Son of Heaven seems to support him now, but his sister is very scared. The Son of Heaven and your brother-in-law are both old and will die. When the new emperor ascends the throne and Li Huan inherits the title of duke, if Tianjin becomes the same as the rest of the Ming Dynasty and becomes weak, will the imperial court at that time let Li Huan go? ”

Cui He wiped his eyes and said, "I'm afraid that at that time, the imperial court will not hesitate to deprive Li Huan of his title and slowly clean up your brother-in-law's children and grandchildren." ”

Cui He shed two more lines of tears and said, "Second brother, you are Li Huan's uncle, you can't watch Li Huan fall into a predicament and inherit a mess." ”

"You must catch the traitor who caused the collapse of the factory! For your brother-in-law, but also for your nephew and niece! As long as you let it go, your nephew will not forget your merits when he takes power, and he will definitely promote the children of the Cui family. ”

Cui Changwu couldn't help but sigh when he heard Cui He's words.

He knew he had no way back.