After the initial solution to the problem of mercury poisoning, Marin began to prepare for the production of mercury tinned foil glass mirrors. The imitation of the silver frame is very simple, and the carving on the silver frame is made the same as that of the Venetian.

As for the problem of translucent glass, it is also easy to get on Marin's side. Even, the quality is better than the Venetian's optical glass.

In fact, there are two levels of optical glass in Beihaiguo. One is leaded glass, which is slightly lower quality; The other is high-quality glass with chemically treated quartz sand, which is generally used as a military telescope.

The reason for lead glass is very simple, that is, to add lead oxide. After the addition of lead oxide, the viscosity and melting temperature of the glass are reduced, which is very convenient for glass processing. After all, when processing glass products, the biggest fear is that the glass melt is too viscous to make the desired shape. However, if the viscosity is lowered, it will be much easier to craft items.

In addition, the reduction of the melting temperature is also beneficial. The advantage is that the hardening speed is a little slower during the gradual cooling of the hot glass melt, which makes it easier for the craftsman to process complex points.

Since Marin promoted the use of coal and lead oxide in the Beihai Glass Factory, the manufacturing speed of Beihai Glassware has risen to a new level. As for the quality, it's also very good. After all, lead glass transmits light very well, making it ideal for use as window glass.

However, there is also a problem with lead glass, which is that it is best not to use it as a container for food, especially hot soup. Because, the lead ions in the lead glass, after being affected by the high temperature of the hot soup, are easy to free out and be absorbed by the person who drinks the soup. If you make a wine glass, it is easy to precipitate lead ions in the sake.

Therefore, Marin has always banned the use of lead glass to make eating and drinking tools, and only allowed it to be used to make window glass and other craft products. As for glass cutlery and wine glasses for eating, Marlin only allowed the most basic green glass. It's not good-looking, but it's safe and healthy.

Of course, the optical glass made by chemically treating quartz sand can also be used to make tableware and wine glasses. However, the cost is higher.

The so-called chemical treatment method is actually to grind quartz sand into powder and put it into sulfuric acid or hydrochloric acid solution for "cleaning". Quartz sand is silica and is insoluble in acids. However, impurities such as iron ions can be washed away by acid.

In this way, the quartz sand powder after pickling is then washed and used to make glass, and there are very few impurities, which can be used to make optical glass.

But in this era, chemistry was underdeveloped, and the cost of making acid was high. Moreover, the cost of grinding the extremely hard quartz sand into powder form is very high. Therefore, the high-quality optical glass produced by this method is generally only used to make military telescopes. Lead glass is the main force of translucent glass.

In fact, the quality of lead glass is a little worse than that of chemically treated optical glass. Moreover, the cost is much lower. It is not impossible to make a telescope out of lead glass. But that was later, and now, Marin first used lead glass to make glass mirrors.

Moreover, the quality of lead glass seems to be a little better than that of the transparent glass made by the Venetians from manganese dioxide (that is, pyrolite). Because, the manganese glass of the Venetian had good light transmittance at first. But over time, it is easy to turn into lilac glass. It seems that it is the manganese ions that have been oxidized to form a purple manganate substance similar to potassium permanganate, which reduces the light transmittance of the glass and becomes "old glass". And the lead glass of Beihai Country does not seem to have similar problems. Anyway, it is used as a mirror, and it is not used to hold hot soup, so the precipitation of lead ions should not be much.

In other words, in the end, the quality of the pirated mercury tin-plated glass mirror from the Beihai Kingdom was slightly superior. Moreover, after the cleaning of sulfur powder, the safety is also better.

The only problem is probably that if the tin foil layer is not coated with varnish, when the sulfur powder is buried and heated, it is easy to let the tin foil layer react with the sulfur to form tin sulfide, which is commonly known as gold powder.

However, if the tin foil layer is well protected with varnish and the heating temperature is not too high, the tin foil layer will not be affected too much.

After mapping and replicating the Venetian mercury tin-plated glass mirrors, Marin immediately had people start producing them by reacting tin-amalgamation to make mercury tin-plated foil glass mirrors. The original mirror, which was bought at a high price, was sent to the ship to Panama, and took the Pacific route to the Ming Dynasty to be presented to Emperor Zhengde.

Moreover, Marin deliberately emphasized that this is a glass mirror worth more than 20,000 taels of silver, which is the world's first glass mirror. Well, the envoy will tell the Ministry of Rites of the Ming Dynasty that this is the lord of the Beihai Kingdom, Ma Lin, spent more than 20,000 taels of silver to bring it to the Ming Emperor from a country rich in glaze called Venice......

In this way, the high price, coupled with the extraordinary effect, will definitely make Zhengde "Longyan Dayue", and the reward must be a lot. Then, Marin was trying to find a way to make it bad and buy the eunuch to speak ill of the Portuguese. Under the preconceived idea, it will be difficult for the Portuguese to go to the relationship in the future......

Not only the Portuguese, but even the Spaniards, Marin would bribe the eunuchs to slander and cut off his idea of learning Marin as a vassal of the Ming Dynasty.

Spain wants to learn from Marin as a vassal of the Ming Dynasty? Yes, Ma Lin will ask Kong Tai to buy those eunuchs and let them say that if you want to become a vassal of the Ming Dynasty, in addition to offering a heavy treasure like the sweet potato offered by the Beihai Kingdom, the monarch of the country should also come to the Ming Dynasty once and bow down to the Ming Emperor in order to express his sincerity......

This is more pitiful, because the king of Spain and the king of Portugal have always been very proud and think that their status is equal to that of the Ming Emperor. Historically, the letters of state that Spain asked Columbus to bring to the Chinese emperor were also written in the tone of equal exchanges.

I want the king of Spain or the king of Portugal to take the risk and go to the Ming Dynasty to bow down to the Ming Emperor...... These two countries are certainly not happy......

You know, in these days, how dangerous it is to sail. The monarch of an ordinary country would not draw his parents and children to participate in the great voyage, what if he died at sea?

Even when Marin committed the shaft, he must go to Daming, and he was mentally prepared to hang up at sea, and even wrote a suicide note.

Therefore, just letting the Spanish monarch personally go to Beijing to kowtow to the emperor of the Ming Dynasty can cut off the possibility of Spain's success. After all, the pride of the Spaniards is obvious. Otherwise, they would not have given birth to the ridiculous idea of sending more than 10,000 troops to conquer the Ming Dynasty.

In fact, the Spaniards were probably inspired by the Japanese and saw the erosion of the southeastern coastal guards of the Ming Dynasty, so they came up with such ideas.

However, the Spaniards did not know that on the northern border of the Ming Dynasty, there were a large number of elites. Japan's Toyotomi Hideyoshi, however, sent 200,000 troops to invade Korea, but was also defeated by the Ming army.

What's more, at that time, the Qi family army left by Qi Jiguang, the last god of war of the Ming Dynasty, was still there, and if it really fought, Spain would be able to scourge the southeast coast at best. Once it goes deep into the interior and forces the Ming Dynasty to mobilize border troops over, it will be difficult to say. After all, the Ming army was not backward in weapons and equipment at that time, with both Francophone guns and arquebuses, and there was no pressure from Houjin, so it could still cope with it.

In addition, the ancient Chinese people liked to use stratagems, maybe poison the food, attack and burn a camp at night, and keep the Spaniards very sour.

And there were many civil officials like Wang Feng who thought more, and there were many in the Ming Dynasty. What's more, the time when Spain planned to invade was not the time when the peasant army and the Houjin joined forces inside and outside the Chongzhen period to make trouble together. As long as the Ming Dynasty can concentrate its forces, it is still very strong. Didn't you see that the Ming Dynasty suppressed the Yao uprising, so it sent an army of 160,000?

In addition, in this era, even if the Spaniards learned the Spanish phalanx, they were not able to transport tens of thousands of troops to the Far East.

Of course, Marin will stab Spain in the back while pretending to be a good person. For example, to give a little profit to the Spanish in silk and porcelain to win their favor. After all, Spain was strong at this time, and Marin did not want to compete with other powers at the same time as France......

It is foreseeable that Spain may send a fake monarch to pretend to be tributary kowtow in exchange for the tributary qualification of the Ming Dynasty. Even, Marin's spies in Spain had already heard that the Spaniards were discussing whether to use such a scheme to defraud the tributary trade qualifications. When the time comes, it will be a question of who will expose the lies......

On Kong Tai's side, he can naturally expose it. However, they could not stand up. After all, the North Sea States and Spain were "allies". Therefore, in the future, stabbing the Spaniards and exposing their possible tricks will require the intervention of a third party.

After thinking about it, Marin hit the Holy See with his idea......

This operation is also very simple, that is, let the Holy See send missionary priests to Guangzhou. Marin would then pay a large sum of money to buy a French priest to join them.

When the Spaniards came up with a fake tribute to fool the Ming Dynasty, let this French missionary stand up and expose the truth...... The French and Spain are mortal enemies, and they are not negotiable, and they are reasonable...... When the time comes, it will be up to the French and Spain to continue to tear apart, and it is none of Marin's business......

But first, Marin needed to buy such a French missionary. Moreover, it was necessary to ensure that this man would not send useful information to France after arriving in Canton, so as not to arouse France's coveting of Chinese products, especially technology (French missionaries were well-known commercial spies)......

For this reason, Kohler was instructed to find a French priest who had no good feelings for his country and was easy to buy. Then, he was sent to Guangzhou as a missionary, and waited to stab the Spaniards......

Marin estimated that in order to obtain huge profits from the trade of silk and porcelain, Spain might send a fake monarch to kowtow in the name of the Spice Islands. And this French priest who was bought by Marin, when the time comes, the task is to stand up and expose the truth and tell the Ming Dynasty that the Spaniards are deceiving the Ming Dynasty...... Yes, in the future, the Spaniards will be included in the Ming blacklist like Portugal......