On the other side, Richard didn't know what happened to the mine and Mullen after leaving, so he just rushed to the next target location with Gro and his party.

To make cobalt blue, three raw materials are needed: cobalt ore, alumina, and phosphoric acid.

Cobalt ore has been obtained, and phosphoric acid is already there, so what needs to be solved now is the problem of alumina.

Generally speaking, in the current medieval-like world, everything that has to do with metal and aluminum is not very easy to obtain. The main reason is that the current world's scientific and technological level is limited, which makes it difficult to extract aluminum. It is precisely for this reason that in the Blue Lion Kingdom, the experimental method was chosen to prepare ether instead of the industrial method catalyzed by metal aluminum.

However, alumina, as a compound that is bordered by metal aluminum, is a relatively alternative existence. The scientific name of alumina is aluminum oxide (Al2O3), which is undeniably rare and precious in the current world. But it can be obtained directly by purchasing it in the simplest way. Because aluminum oxide has another name, it is called corundum, which is also known as ruby.

Yes, rubies.

......

Emerald City, in the VIP room of a jewelry store.

Richard and Groh sat at the table, while the nearly sixty-year-old jewelry store owner stood respectfully beside him, glancing out the door from time to time, a little anxious.

In the long wait, small footsteps sounded, and the faithful steward of a jewelry store walked in cautiously with a black walnut box, nodding to the owner of the jewelry store.

The jewelry store owner breathed a sigh of relief, stepped forward and quickly took the box, turned around and gently placed it on the table, and when it was opened, it revealed a huge ruby inside.

Looking at Gro, the owner of the jewelry store asked tentatively, "Your Royal Highness Prince Gro, you see, this is the largest ruby in our store, does it meet your needs?"

Gro didn't say anything, just turned his head to look at Richard.

Richard glanced at the ruby and nodded.

Gro looked at the owner of the jewelry store, and immediately said without any verbosity: "Say, how much money, I want it." ”

"Well, this ......" The owner of the jewelry store hesitated slightly, feeling tricky about the offer. If the price is too high, I am afraid of offending the prince Gro, and if the price is low, the store will lose money.

In this case......

The owner of the jewelry store didn't come up with an idea for a long time.

Gro was a little impatient and urged: "How much is it?"

The owner of the jewelry store had no choice but to make a hard offer.

"One hundred ......" The owner of the jewelry store said tentatively, staring at Gro's expression, he originally wanted to say the price of more than a hundred gold coins, but when he saw Gro's eyebrows furrowed slightly, he immediately swallowed the number behind one hundred into his stomach, and said a little stiffly, "One hundred...... amount, gold coins. ”

One hundred gold coins, this is the price of the huge ruby in the box, which is not expensive, but it is also a huge amount of money.

Richard looked at Gro.

With a wave of his hand, Gro's guards opened the money bag, counted the gold coins and threw them to the jewelry store owner, then picked up the box containing the ruby and walked out the door.

Bowing down to send Richard and Gro away, the jewelry store owner walked back to the store and couldn't help wiping a cold sweat. The price at which the ruby was sold for 100 gold coins can only be said to be the cost price, which is actually a bit of a loss considering the cost of storage in the store. But in the face of His Royal Highness the prince of the kingdom, he can only consider himself unlucky, hoping to earn it back from the rest.

The owner of the jewelry store thought that when he walked into the VIP room, he suddenly stiffened and saw a person in a black robe with his whole face hidden in a hood sitting in the VIP room, as if he appeared out of thin air.

"You ......"

"I'm just a shopping guest, don't be nervous. The black-robed man said lightly, "I came to your shop for the simple reason that I need to buy some low-level spell casting materials, well, of course, in your eyes, it's just some gems." ”

"Forehead ......"

"Bring all the gems in your shop, I'm going to pick them. ”

"This ......" The owner of the jewelry store looked at the black-robed man, feeling an inexplicable pressure, even greater than what he felt from Gro, and couldn't help but want to call someone, but there was a voice in his heart telling him that it was best not to do this.

The black-robed man looked at him for a long time and reminded him, "My time is precious, you'd better hurry." ”

"Uh, yes, yes. The owner of the jewelry store pursed his lips in response, and finally walked out of the door with some complications in his heart.

......

Moment.

The tables in the VIP room were filled with wooden boxes of various sizes, all of which had been opened, revealing gems of various colors inside.

The black-robed man looked at all the gems on the table, and finally selected a few of them with a little disgust, and said to himself: "Sure enough, it is a barren land, basically there is nothing that can be used, and the quality that can be used is extremely poor, but it can only be like this." ”

"Guest, how are you going to pay......" The owner of the jewelry store said, and the next moment he stopped abruptly, and saw the black-robed man turn around, revealing a face under the robe, and a pair of eyes glowing with oily green light, like two ghost fires burning, looking directly at him, making him a little creepy.

"You know, I wanted to kill you directly, it's the easiest. The black-robed man spoke up, his tone a little gloomy, but then his tone changed, "But...... Since you are so obedient, I think I would like to give you a reward. ”

Raising his hand, a purple ball of light the size of a date appeared on the black-robed man's fingertips and sent it towards the forehead of the jewelry store owner.

The owner of the jewelry store was so frightened that he wanted to run away, he was so frightened that he wanted to shout. But he found that his body was locked, he couldn't run at all, his throat was so dry, and he couldn't make a sound, so he could only see the purple ball of light getting closer and closer to his forehead, and then submerged under the skin and into his body.

At the moment when the ball of light entered his body, the jewelry store owner's body shook suddenly, only to feel a sudden heat all over his body, his brain went blank, and his eyes showed a confused and dull gaze.

"What I'm giving you is a special energy that can extend your life for two years, and it should be fair to pay for the spellcasting materials. The black-robed man spoke up, "Of course, there is a condition that you have to forget me and everything you have in contact with me. So be it. ”

After speaking, the figure of the black-robed figure twisted violently and disappeared into the VIP room like green smoke.

For a long time, the owner of the jewelry store seemed to be awakened in his sleep, blinked his eyes and looked around, and when he saw the boxes of various jewels opened on the table, his eyes widened, and he couldn't help shouting: "Come on, come on!"

Soon, the faithful steward ran in, looked at the owner of the jewelry store, and asked, "Boss, what's wrong?"

"This ......," the owner of the jewelry store asked, pointing to the many boxes on the table with trembling fingers, "this ...... What the hell is going on? Aren't these boxes supposed to be locked in warehouses and counters, and how did they all get here?"

"Boss, aren't these all you asked me to bring in, I asked you why just now, and you still don't tell me the reason, how can you ......?"

"This ......" The owner of the jewelry store was stunned, his brows furrowed deeply, and he couldn't help but rub his gray hair. After rubbing it for a moment, he put down his hand, and suddenly found that there was a reddish-brown hair between his fingers. It was his hair color when he was younger, but now ......

The owner of the jewelry store was completely stunned.

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