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The clock of time moves backwards, the bright moon drifts in the sky, and the sprinkling of light softens the whole world.

The Wuxiu branch was quiet, except for the small laboratory at the foot that glowed yellow. The door was unlocked, and there were still figures passing by from time to time.

Master Qingyun, who had been silent for a long time, came to the Wuxiu branch, stood in the courtyard, looked at the situation in the laboratory, and raised his eyebrows slightly.

It's so late, could it be Teacher Xia?

With curiosity in mind, Master Qingyun walked lightly towards the laboratory.

Su Wanxia stood in front of the experiment table, holding a test tube of colorless liquid in her hand, and a faint silver barrier floated around her body, isolating the surrounding air from it.

This is the potassium cyanide she just developed. It is extremely toxic and strongly alkaline. It deliquesces in humid air and releases a small amount of hydrogen cyanide gas. It is easily soluble in water and slightly soluble in alcohol. The aqueous solution is strongly alkaline. Skin wounds or inhalation of a small amount of powder can lead to poisoning and death. It can release highly toxic hydrogen cyanide gas when it is decomposed in contact with acid, and it can explode when mixed with chlorate or sodium nitrite.

Its degree of harm is definitely higher than the concentrated sulfuric acid she poured on Xiao Feixue before.

She spent a lot of effort to extract a little bit, especially the cyanide ion, which really embarrassed her for a long time.

If she dissolves the poison in the equipment for refining swords, or hides it in a hidden weapon, then... she can perfectly swear to see the meaning of blood sealing the throat.

It's just that she hasn't tried it before, and she doesn't know if it can be successful. In addition, hydrogen cyanide will corrode iron and other metals under certain conditions, which makes the refining process even more difficult.

However, the things here are slightly different from the modern ones, and their characteristics are not completely consistent. She can use this to try.

Her thoughts were like the wind, and her thoughts were flowing, but it didn't matter, the door was suddenly pushed open, and she was so startled that she subconsciously turned her head, interrupted her thoughts and looked at the door.

Master Qingyun looked with curious eyes, but caught a glimpse of Su Wanxia who was covering his face tightly, and his expression immediately became serious.

"Who dares to trespass on Qingxuan...... What do you want to do!" Before he finished speaking, a layer of silver barrier had already fallen on his body, imprisoning him.

Su Wanxia pulled off the mask on her face, frowned at Qingyun, and said in a cold tone, "Master Qingyun doesn't sleep at night, what are you doing here? Or do you want to try again the tragedy that happened at Qingyun Auction House last time? "

Qingyun didn't expect Su Wanxia to be standing in front of him. He was taken aback for a moment before quickly reacting and said, "You bastard, what are you doing sneaking around in the lab at night? Why did you use a barrier to lock me up? This is treason, are you Do you want to leave Qingxuan directly?" He spoke sharply, scolding Su Wanxia loudly, and the instructor was putting on airs.

Su Wanxia sneered, slowly put the test tube in her hand on the stand, and took off the white gloves in her hand, "Let me tell you first, this is the laboratory assigned to me by Instructor Xia. As long as he comes in and out on weekdays, he will bring all the test tubes with him." I put on a mask, gloves, and even a gas mask. I was doing a very dangerous experiment just now, and the air is full of poisonous gas. Are you sure you want me to remove the barrier... What do you, a powerless weapon master, do? protect yourself?"

Qingyun opened his eyes wide at dusk, looked around in surprise, then shifted his gaze to Su Wanxia, ​​"Is there poison in the air?"

Su Wanxia didn't say a word, and directly removed the enchantment from Qingyun's body.

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