The last yellow leaf on the plane tree in the prison swirls and slowly falls, symbolizing the end of late autumn in the imperial capital, the cold winter is coming, the sky above the prison no longer sees the eastward migratory birds, and the imperial capital also begins to have a trace of chill, cold people's hearts. Pen "Fun" Pavilion www.biquge.info

Dressed in a very warm autumn prison uniform, holding a transparent test tube in his hand, gently shaking the pale yellow liquid in the test tube, Carré's eyes were extremely focused, watching the color of the liquid gradually fade, the liquid became transparent, and stopped the device in his hand.

The test tube was fixed about three centimeters above the flame vent, and the heating device on the alchemy table was turned on somewhat unfamiliarly, and the blue-purple animal oil flame rose, and the hottest outer flame touched the bottom of the test tube, heating the liquid in the test tube.

"The flame temperature is 500 degrees, which is too high for the corroded stock solution, and it is reduced to about 300 degrees." Feeling the scorching heat of the blue-purple flames, Wei Xi reminded him.

"Yes." Answering silently in his heart, Carley stretched out his hand to the lower right of the alchemy table, where was a rectangular table top with a length and width of about fifty centimeters, large and small roughly circular buttons were regularly distributed in this rectangular space, the buttons were of different colors, and various symbols were engraved on them.

This is the operation area of the alchemy table, those buttons are used to control the temperature of the alchemy table's flame, the size of the water flow, the separation speed of the separator, the rolling pressure of the roller, etc., for these tedious buttons, Carré does not know their function, but under the guidance of Weixi, who has mastered a lot of alchemy knowledge, all this is not a problem.

Following Wei Xi's guidance, his fingers clicked on a few buttons a few times, and then twisted a large red button about half a circle, the color of the blue-purple flame was a little lighter, and the flame was not so hot.

"Very good, it's this temperature, heat it for a minute, until the corrosion stock solution starts to boil slightly." Vichy said faintly in Carre's mind.

Seeing that the liquid in the test tube began to boil, Carré carefully pulled out the test tubes of various fruit extracts from the test tube rack and added them to the corrosion stock solution according to Vichy's instructions.

Bright yellow lemon extract, turquoise apple extract, lilac grape extract...... In a certain order, a certain amount, it is added to the corrosion stock solution.

If he hadn't been in the Royal Prison, it would have been impossible for him to get so many kinds of fruits, and you must know that the price of some of these out-of-season fruits is not cheap, and many civilians will not be able to eat this kind of out-of-season fruit in their lifetime.

After getting this, Carré breathed a sigh of relief, took out a tissue and wiped the sweat on his head, although the configuration of black iron corrosive liquid does not require much strength, it does not consume much physical strength, but it requires the spirit to hit all the time, and can not be relaxed by a trace, which is a great challenge to the spirit, the first few times it was because of his accidental laxity, which led to the failure of Weixi's improved black iron corrosive fluid configuration.

No wonder alchemists are very rare, Carré sighed in his heart, with his spiritual power comparable to that of a half-step martial king, he dared to be a little unbearable, although he was not particularly familiar with alchemy, but it could also be seen that the spiritual power alone blocked countless people who wanted to become alchemists.

After the corrosive stock solution was heated by the flame for about five minutes, the color of the liquid changed in various ways, and then it became transparent again, and then, with a gentle explosion, a fist-sized white mist exploded from the test tube, emitting a pungent smell.

"That's it!" Visie reminded aloud.

Carré's heart froze, at the last moment, he reached out and clicked on the button, turned off the blue and purple beast oil flame, and then took out the test tube with a test tube clamp, staring at the black iron corrosive liquid with a little fiery eyes, on the third day of telling Red, he received this set of alchemy equipment, after nearly a week, after several failures, he finally prepared the black iron corrosive liquid improved by Wei Xi.

"Weixi, can these liquids made from various fruits corrode black iron?" Smelling the pungent smell of urine from the test tube that had been aged for several days, Carré frowned slightly.

"It should be possible, I have asked you to replace the materials in the original recipe of the black iron corrosive liquid, no accident, it should be possible to corrode the black iron, even if it doesn't work, it should be changed in the amount of various fruit extracts, as for the materials, there should be no problem." Vish replied, her voice uncertain.

"Test it first!"

Carré nodded, and used a glass dropper to suck some of the black iron corrosion fluid from the test tube, and dripped it onto a weight block on his weight jacket, which was made of black iron.

The black iron corrosion liquid drips on the palm-sized weight block, Carré drips all the black iron corrosion liquid in a test tube, looks at the weight block, the corrosion liquid just touches the weight block, and suddenly makes a "sizzle" sound.

As the sound dissipated, large and small corroded potholes appeared on the weight block, seeing this scene, Carley frowned slightly, a test tube of black iron corrosion liquid, although it is not much, about 20 ml, but this is extracted with nearly ten catties of fruit, according to Wei Xi's speculation, these corrosion liquid can corrode at least twenty kilograms of black iron, that is, four weight blocks, but these corrosion liquid only corroded the weight block only one-tenth of the extent, the effect is far lower than Wei Xi's estimate.

If the corrosive liquid only has this effect, the three-meter-thick black iron plate is corroded into a pit for people to pass through, and the fruit consumed is estimated to be nearly 100 tons, which is the consumption of the Royal Prison for a year.

Seeing the corrosive effect of the corrosive liquid, Wei Xi said unsurprisingly, "The corrosive effect is only one-fiftieth of the estimate, but it is also correspondingly explained that there is no major problem with my improved formula, and if you want to achieve all the corrosive effects, the amount of various fruit extracts should be modified."

However, estimating the ratio of various portions requires a lot of testing to measure, after all, I don't know the various components of fruit very well, but if there are books in the library about the measurement of fruit ingredients, it will save a lot of time. ”

Hearing Vichy's answer, Carré's brow furrowed, nodded, and said, "Okay, I'll clean up and go to the library." ”

Rather than using a lot of tests to obtain the black iron corrosive fluid, he still tended to go to the library to see if there were any books on it, after all, the fruit he could obtain was limited.

Take the test tube to the bathroom and wash it carefully until the water flow on the test tube wall can form a water film that adheres to the test tube wall, Carré did not dare to be sloppy, but Vichy had warned him that any little residue on the test tube could cause his black iron corrosive fluid to fail.