Out of the space, Gervais hurried back to the inner fort with the cauldron, and in the kitchen, Gervais instructed the servants to find a large wooden basin and a smaller copper basin.

Bronze ware is also popular in this world, some nobles can't afford to buy enough silverware, so they will use bronze instead, but Gervais knows that long-term use of bronze to hold food is not good for health, so the bronze utensils in Gervais Castle are used to fill him with water for washing, and the castle has a lot of reserves, which are just used to make ice this time.

Gervais first asked the servant to put the copper basin into the wooden basin, then filled the wooden basin with water, and when everything was done, Gervais poured out the viscous brine in the cauldron, leaving only the white nitrate, and then Gervais carefully poured all the nitrate into the wooden basin.

When everything was done, Gervais got up and clapped his hands, but looking at the fierce sunlight outside the castle, Gervais was not at ease, and took a large pot lid and covered it directly on the wooden basin.

"It should be okay now."

For the use of nitrate to make ice, Gervais has not personally operated, but the process seen from the inside is similar, that is, let the nitrate and water fuse to produce a reaction, and then the nitrate in the wooden basin will absorb a lot of heat, and the temperature can be reduced to make ice cubes, nitrate can not be eaten directly, so you need to add a copper basin with good cold and heat conductivity in the wooden basin, add clean water to the basin, and wait for the water to become ice, the ice cubes in the copper basin can be eaten directly, no need to worry about safety.

"Alright, you're done!"

Nashen and Anna had been by Gervais's side all the time, and they had witnessed everything Gervais had done, and in the cave, Gervais was able to boil white crystals in water, which opened their eyes, and although they didn't know what it was for, they knew it was extraordinary at a glance.

It's just that after arriving at the inner castle, Anna and Nashen can't understand Gervais's operation, how can the freshly cooked things be reintegrated into the water, isn't this useless work?

Although Anna didn't understand, she had a mysterious confidence in her own adulthood, so she didn't ask anything, but Nashen couldn't help but ask: "Young Master Gervais, you just boiled these white things, why did you put them in the water again?" ”

"Ice! I'm going to make ice. ”

"Bing? Ice? ”

Nashen didn't understand what the word Gervais was talking about.

"It's the ice cube that only the great nobles can eat this season!"

Gervais was happy, and he didn't hide it, and said it directly.

"Really? Master Gervais, can you get ice cubes this way? ”

Na Shen suddenly became excited, and his voice raised a lot, and his eyes widened in disbelief.

"Of course it's true, Lord Nashen can taste it later! Ha ha! ”

Gervais was already too excited to see Nashen, and then looked at the little maid Anna, whose eyes were round, looking at him with watery eyes, and his eyes were full of admiration, which made Gervais's smugness even worse.

"I'm sorry Master Gervais, I just lost my words, but this is the first time I've seen such a magical thing!"

Nashen reacted at this time, and felt that the sentence just now was a little suspicious of Gervais's meaning, which was very rude to the nobles and easy to cause others to resent it, so he immediately explained to Gervais.

"Well, I can understand that Lord Nashen doesn't have to apologize!"

Being able to make artificial ice in the summer is no less incredible for Nashen than building a rocket to fly into the sky, Gervais is not surprised by their surprise, if anyone on earth tells him that he can cultivate Dou Qi, Gervais will definitely give him a brain and tell him to walk away mellowly.

"If you can really make ice, Young Master Gervais will have to send more people to guard that courtyard, and the candidates who enter the mineral space must also be loyal and reliable!"

Seeing that Gervais didn't mind, Nashen breathed a sigh of relief, and then began to give Gervais advice.

"Well, I'll arrange this matter, Lord Nashen, please rest assured!"

Nitrate is important to Gervais, and of course he will defend it tightly, Nitrate is currently unique in this world, and it is about the future of Stormwind.

The reason why Gervais didn't hide people's eyes and ears to boil nitrate, and then make ice, is to let people subconsciously combine nitrate and ice, and after he made gunpowder, no one will associate gunpowder with nitrate, ice and nitrate just act as a shield to hide the secret of gunpowder.

For this purpose, even if Nashen, Anna, and those servants would not necessarily reveal the news, Gervais would take the initiative to tell others about the ice-making process in the future.

Looking at the tub, Gervais knew that it would take a little time to get the ice, so he broke away Nashen and Anna and returned to the study on the third floor alone, where he could conceive of gunpowder and muskets now that he had nitrate.

The main ingredients of gunpowder are nitrate, sulfur and charcoal, and the production process Gervais also has a lot of memories in his mind, but it still needs to be written out and slowly sorted out and experimented.

What he needed most now was to think about how to make a musket, and he didn't have to worry about the hardness of the musket barrel, because he had Mithril, a material with the most advanced armor hardness on earth, so he only needed to think about how to make a musket.

He first thought of the structure of the most representative arquebus in ancient times, the gun has a metal hook, one end of the hook is fixed to the gun, and can rotate around the axis, the other end is clamped with a slow-burning arquebus, when the soldier fires, he pushes the metal hook into the fire door with his hand, so that the burning fire rope ignites the black powder, so as to fire the projectile filled in the chamber.

The arquebus is a piece of hemp rope or a tightly twisted strip of cloth, soaked in nitrate or other salt solutions and dried, which can achieve slow burning but not extinguishing, and the burning rate is about 80 mm to 120 mm per hour, so that the soldier can hold the gun in one or both hands after pressing the metal hook into the fire door, and his eyes are always aimed at the target.

Gervais is going to draw a drawing of the parts of the arquebus, and ask Bernard to build a shot for him to try the effect first, the world's long-range weapons only have longbows, not even crossbows, but if you want to train a good longbowman, it takes a long time to train.

Gervais was originally going to try to make a bow and crossbow in his free time, but now that he has nitrate, he directly skips the bow and crossbow, ready to see if the musket can replace the longbow, after all, he has an advantage in making muskets, that is, the hard barrel material, which means that Gervais does not have to worry about the problem of exploding, and can fill more gunpowder, and the power will be much greater.

"I just don't know if the power of the musket is a threat to those knights."

As long as the musket is made, there is no doubt about the lethality of ordinary soldiers, but for the title knights with inhuman force, especially the high-level bronze knights, and the silver knights, Gervais feels a little unreliable.

However, Gervais was not prepared to use muskets against high-ranking knights, but just wanted to quickly equip ordinary guards to face small-scale battles, such as the night of interception, if each person had a musket that day, a salvo could wipe out at least half of the enemy soldiers.