In the first experiment, Yang Wenli tried to save trouble, and the shells were only cleaned and dried once, and then they were burned in the furnace. The ash that comes out of the burnt is mixed with impurities that can be discerned by the naked eye, and the purity is not as good as that of freshwater shells, which is definitely not good.

However, the white ash of these large seashells is indeed much better than that of freshwater shells, and if you ignore those impurities, this is the best quality calcium oxide.

Although the first calcining failed, Yang Wenli was full of confidence, as long as the impurities were removed, he would not be far from success.

In fact, there are also shell porcelain in later generations, and it is also the top porcelain, but the number is scarce, and it is not as famous as bone china, so it is not known to the world. It may be that the shell porcelain is difficult to remove impurities, and the labor cost of later generations is very high, and it is impossible to use manual screening.

Times are different, and of course different results have been produced. Yang Wenli doesn't care about working hours, because as long as bone china is successfully developed, he will have to sell a shipload of shells for a piece of porcelain.

The texture of bone china is not comparable to the porcelain of the Ming Dynasty, the crystal white like jade is more exquisite than Hetian white jade, and he is stupid if he does not sell it at a sky-high price.

What are the ways to remove impurities? In ancient times, there was no machinery, and there was no chemical pickling technology, so you had to use an iron brush to wipe tirelessly until the shell revealed the white-gray inside.

"Young Master, do you think it's okay like this?" Yang Renyue raised the shell in his hand and said.

"There's still a little bit of it in those cracks that hasn't been removed, and you have to think of a way, no matter what method you use, I just want pure shells." Yang Wenli took the shell and said after only a little effort.

"Whoa! I'll think about it again. Yang Renyue immediately agreed.

The main living environment of the shell is in the mud and sand, and it is normal to have mud and sand in the cracks of the ditch, but these mud and sand are the impurities that Yang Wenli does not want to see.

Now it's just an experiment, and Yang Renyue, a young man, helped Yang Wenli brush shells while practicing, saving him a lot of effort.

The second calcination experiment was an unsurprising success, each shell was clean, and the ash was very pure, and after being crushed, the ash was fine, and it was as white and lubricated as pearl powder.

Now the final step of the experiment can be carried out, and the plain tire firing has already been successful, only the last step of glaze firing is missing. It must be said that the reverberatory furnace invented by Yang Wenli has a high furnace temperature that can directly make steel, which does not mean that ordinary porcelain kilns can also reach such a high furnace temperature, so in fact, only Yang Wenli can fire the top bone china in the world.

"It's not crystal clear enough, adjust the formula again, add some calcium oxide ingredients, and see how it works?" Yang Wenli held the bone china bowl that had just cooled out of the oven in his hand and said to himself. Then he smashed the bone china bowl, which was already very white.

Fortunately, the old lady was not present, otherwise he would have scolded him for being a loser, Yang Wenli is such a person, he pursues perfection, and it is his character that bone china can be successfully developed.

There was no waste of time, and the next day, Yang Wenli re-lit the fire, increased the calcium oxide content to 45%, and the feldspar and quartz sand content was also reduced a little accordingly, and the clay content was reduced the most, getting closer and closer to the top bone china formula of later generations.

It's a pity that it failed again, this time it was the broken tire, and Yang Wenli fell into a repeated cycle of finding the cause.

Scientific experiments are not so easy to succeed, Yang Wenli's heart is not wavering, and he is full of energy to devote himself to the next experiment.

"This time, we have to knead the material a little more, and then adjust the furnace fire to a slower temperature, and try to do it, and the future generations can only achieve 25% of the clay, and it is impossible for the clay content to reach 27%." Yang Wenli, who is caught up in scientific experiments, often talks to himself, a typical Frankenstein.

Another experiment still failed, this time Yang Wenli found the reason, it was that the blank was wet, and there may be tiny bubble holes when it was dried, so it broke when it was fired in the kiln.

It's easy to find out why, as long as the water content is lowered when mixing the ingredients, but he doesn't have much hope for the next experiment. A year had passed, and he was used to failure.

Yes, another year has passed in the blink of an eye, and the text introduction may only be a few hundred words, but in fact, each experiment takes more than a week of effort.

Air-drying tires is the most time-consuming, a week is still a summer temperature, if it is spring, the time will be doubled.

And every time the furnace is fired, the fire must be turned off and the cooling must be slow, and this link is also extremely time-consuming, so a year has passed, and Yang Wenli still has not fired the bone china that satisfies him.

It is extremely difficult to fire bone china, but the young men have made rapid progress in practicing arrows. As the oil seller said, only the hands are familiar! The teenagers already knew the principle of shooting, the only thing missing was practice. Therefore, a year has passed, and they have initially reached the realm of being a precedent.

The reason why they are preliminary, is that they still lack a little bit of heat, and when they shoot at free targets, they miss the target once and a half out of ten.

The free target is a frisbee borrowed by Yang Wenli from the shooting competitions of later generations, but here it is not a frisbee, but dirt.

Dirt is much smaller than Frisbee and flies much faster, making it naturally more difficult to shoot. A group of teenagers don't know all this, they don't even know that they are actually the top marksmen in the world, because there is always someone in front of them who is better than them, and the level of all teenagers is also different, they think that archers should be at this level, and they are not good enough.

Poor children, they are so naïve, they are embarrassed by such a demanding standard as Yang Wenli and do not know.

In the fifth year of the Apocalypse, the north became more and more arid, but the heavy taxes did not decrease but increased, causing a large number of yeoman farmers to go bankrupt. Let's put it this way! With the exception of the tax-exempt part of the privileged class, there are no more yeoman farmers in the true sense of the word in the north.

In addition to begging, people eat bark and grass roots, like locusts passing through the border, eating up a piece of it every time it passes.

But fortunately, the national glory of the Ming Dynasty has not been exhausted, the people who unveiled the flag and rebelled have not yet appeared, and the poor peasants at the bottom are used to suffering and being poor, and they only comfort themselves in their hearts that they are guilty of their previous lives, and they should suffer these hardships in this life.

Although the north has started the hell mode, the south is still smooth, and the people's lives have not changed much, and there are only those who are extremely poor, such as the Yang family, who are still full of livestock and abundant grains.

At the end of the day's training, when Yang Wenli started his routine training, he finally released a new training subject.

"Your shooting level has basically met my initial requirements, and then you will blindly train, and your improvement will be limited, so I have decided to send you into two batches to hunt in the mountains, and the time is not limited for the time being, based on the harvest of your hunting. However, you must remember that you must learn to disguise yourself and strictly prohibit contact with outsiders and expose yourself.

Because I want to try to make bone china, I don't have time, I can't accompany you into the mountains to hunt, I wish you success and end your training as soon as possible......"

…… To be continued