When Meccio met his boss behind the scenes with trepidation and excitement, he saw Marlin, whose face was smiling like a chrysanthemum. Of course, unlike the chrysanthemum that Maximilian I laughed at, Maximilian I, who was almost 50 years old, laughed at an old chrysanthemum, the kind that was about to wither. And Marin is still the age when the young man is handsome, and what laughs out is a daisy......

"Hey, our boss's boss has seen it, why is he laughing so obscenely? It looks like I owe a lot of money...... No, isn't it true that he is one of the richest nobles in Europe? Mecchio was confused, and even suspected that Marin in front of him was not Marin. However, Marin was wearing elaborate armor with a family crest and was still sitting on the main seat, which ordinary people would not dare to sit on. In this age of hierarchy, it is fatal to wear clothes and sit in a seat.

"Mecchio, manager of the Florentine branch of the Italian branch of the North Sea Chamber of Commerce, has met the master!" With that, Mecchio bent down with a flattering face.

It stands to reason that Marin is only his owner, and he is not Marin's slave, so he does not need to be called a master. Even when Karn and the others were Marin's attendants, they never called the master (as can be called). So, this thing is definitely a sycophant to the extreme.

Suddenly, Ma Lin made up such a scene in his mind - a clothed slave with a money rat tail dragging a money rat tail on the back of his head, kneeling in front of a child of the Eight Banners with a flattering face, and said with a cheap face, "The slave has seen the master......

For no reason, Marin suddenly felt a feeling of disgust in his heart. However, thinking of the sulfuric acid brought by this goods, Marin's smile immediately couldn't be controlled. Because, with this sulfuric acid, he doesn't have to worry about breaking through the iron gates of Siena.

So, Marin chatted with Mecchio, the sycophant, with a pleasant face......

Through some conversation, Marin learned that the sulfuric acid that Meccio escorted this time was the output of sulfuric acid from several alchemists in Florence in three months, a total of 100 clay pots, each of which was about one liter, all of which were dilute sulfuric acid of average concentration. The reason why it is served in clay pots instead of oak barrels is because sulfuric acid can corrode oak barrels. However, dilute sulfuric acid is also sufficient to dissolve the iron gate. If it is replaced with concentrated sulfuric acid, it will not be able to dissolve the iron door. This is because concentrated sulfuric acid forms a protective film with iron. Marin was even wondering - when dissolving the iron gate with dilute sulfuric acid, should hydrogen be collected to make a hydrogen balloon?

Then, Marin didn't bother to pay attention to Mecchio, and after promising to promote him and reward him with 500 gold coins, he sent him back to Florence.

After sending Mecchio away, Marin returned to Siena with his army and a cart of 100 clay pots of dilute sulfuric acid.

That night, taking advantage of the enemy's inattention, Marin arranged for a trusted special forces member (this tactic is also confidential) to hold a clay pot of dilute sulfuric acid, avoid the sight of the enemy at the head of the city, and quietly touch the big iron gate at the northwest gate of Siena. The warrior then carefully picked up the clay pot and poured the dilute sulfuric acid into the large iron gate at the northwestern gate of Siena......

But to the surprise of this special forces soldier, the iron gate was not dissolved into a large hole as Marin said, but flowed down the iron gate, causing slight corrosion to the bottom of the iron gate. However, the effect is not too obvious. If this efficiency is followed, even if the 100 cans of dilute sulfuric acid are used up, they will not be able to corrode the big iron door......

So, the special forces member immediately went back to report the unfortunate news to Marin......

"What? Slow corrosion? And it all flows to the bottom ground? Marin was taken aback - was his plan going to fail?

"Yes, this acid simply cannot stay on the surface of the erected large iron gate. Once splashed, it will flow down the smooth surface of the gate. Even at the bottom of the acid pool, it appears to be slow to corrode. ”

"Slow corrosion?" Marin thought for a moment, and then it dawned on him......

"My brain, my memory!"

Ma Lin suddenly remembered that in his previous life, the chemistry teacher had said that the metal zinc was generally used to produce hydrogen in the laboratory. This is because zinc is much more reactive than iron. It is feasible to react with iron and dilute sulfuric acid, but it is very slow. Therefore, in order to demonstrate the phenomenon of hydrogen production, hydrogen is generally produced by reacting zinc metal with dilute sulfuric acid or dilute hydrochloric acid, and the process of bubble rise can be seen. If iron is used, it seems to be much slower.

Moreover, pouring dilute sulfuric acid on the big iron gate and putting iron into dilute sulfuric acid are completely different things. Soak the iron in sulfuric acid, the contact area is sufficient, even if the speed is not as slow as zinc, but after a long time, the effect is obvious. However, pouring dilute sulfuric acid on the iron door is different. First of all, the iron gate is erected, and the dilute sulfuric acid will not stay on the gate at all, but will flow down the gate to the ground. Before I could slowly contact the reaction, I landed. In addition, the reaction speed of dilute sulfuric acid and iron is not fast, and it is a waste of sulfuric acid.

In addition, the Sienese had money, and the iron gates they made out were thick enough. If you want to rely on these 100 cans of dilute sulfuric acid to corrode and damage the Iron City Gate, it seems that the feasibility is not high......

Also, Marin remembered again - it seems that in his previous life, even if he used zinc metal to make hydrogen, he also ground zinc into zinc powder in order to increase the contact area as much as possible. If it's a whole block, it's much slower. Because, if you want to corrode the metal inside, you have to corrode the outer part first......

Iron and dilute sulfuric acid reaction is not fast, plus it is a large iron door, and the iron door cannot be thrown into the dilute sulfuric acid pool...... Therefore, it is difficult to use dilute sulfuric acid to corrode the large iron door facing backwards...... At least, this cart of dilute sulfuric acid is not enough......

In addition, Marin also had a serious problem in mind - even if he could corrode a large hole in the heavy iron gate, he would not be able to blow it up if he stuffed it into a powder keg......

Why? Because the iron gate is not the same thing as the oak wooden gate......

Generally speaking, if it is a wooden gate, you can blow it up and get a way into the city by making a hole in the gate and stuffing it into a powder keg.

However, it was the oak gates that were easily blown up and the way into the city appeared. Today, the gates are extremely heavy iron gates. Even if the buried powder keg exploded, it might not be able to blow open the heavy steel gates. If the gates can't be blown up, what's the point of corroding the iron gates into small holes that can be stuffed into powder kegs?

Even if the hole corroded out of the big iron gate happens to be the position of the lock latch of the city gate, it is useless, because, during the attack and defense of the city, the hole in the city gate is often blocked. As long as the city gate itself is not blown up, the city gate hole that has been blocked a long time ago may not be completely blown open...... Therefore, the previous idea that the heavy iron city gate could be destroyed by dilute sulfuric acid was too beautiful...... ()

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