She glanced around and noticed that besides the screen, there were several paintings hanging on the wall, all painted with the same blue pigment.

“I also have a round fan, just like the one on the screen, painted with a smiling face, and it’s also blue.”

As Princess Zhaoyang spoke, she went to her bedroom to fetch a round fan.

Xiao Qingyin grabbed her hand.

"Your Highness, let's go outside first and talk about it."

"What's wrong?"

Princess Zhaoyang was puzzled.

"This blue pigment contains highly toxic components and releases colorless and odorless poisonous gas."

Xiao Qingyin replied.

Princess Zhaoyang was astonished.

"H-How could this be?"

Xiao Qingyin pulled her into the courtyard.

I took her pulse.

She breathed a sigh of relief after taking her pulse.

"Your exposure time was relatively short, and it's currently autumn and winter, so the toxins don't dissipate easily, and your body hasn't been affected yet."

Xiao Qingyin said calmly.

"But for your safety, after these paintings are removed, the room must be ventilated with all doors and windows open for at least a month."

After Princess Zhaoyang realized what was happening, she exclaimed, "My Lord!"

She lifted her skirt and, like a gust of wind, swept past Xiao Qingyin's eyes and disappeared in the blink of an eye.

Xiao Qingyin: "..."

In this timeline, she's the only one who doesn't know how to use light-body skills, right?

...

Marquis Yong'an was painting in his study, using the blue paint he had just bought.

Just as he put down his pen, the study door suddenly opened, and a figure rushed in.

The brushstrokes immediately went astray.

The veins on the forehead of the Marquis of Yong'an throbbed.

He was about to give his unfilial son a good scolding.

But they discovered that the person who entered was their own prince.

“Ning’er, you…”

Before she could finish her question, her own prince snatched her paintbrush, grabbed her arm, and dragged her out of the studio.

Marquis Yong'an: "..."

Ning'er, you've been exposed again.

Princess Zhaoyang dragged the person out before she realized what had happened.

She took out her handkerchief and said breathlessly, "Qingxian, I almost ran out of breath just now, I'm so tired."

Marquis Yong'an paused for a moment.

He took the handkerchief from her hand and wiped away non-existent beads of sweat while comforting her, "Why are you running so fast? If you need anything, just have a servant come and call me."

“I didn’t have time to explain,” Princess Zhaoyang replied. “Qingyin just said that this blue pigment is poisonous and will release poisonous gas.”

Marquis Yong'an's expression immediately changed drastically.

"Did she check on you? Are you alright?"

Princess Zhaoyang shook her head.

“I’ve only been in contact with it for a few days and nothing’s happened. But you spent more than a month painting these pictures. I don’t know how much toxic gas you inhaled. Show it to her quickly.”

"Okay, I'll be right there."

When Marquis Yong'an and Princess Zhaoyang returned to the main courtyard, Xiao Qingyin remained where she was.

After taking the pulse of the Marquis of Yong'an, she wrote a prescription.

“Your body has accumulated toxins. Take this medicine for five days, and then I will give you another diagnosis.”

Marquis Yong'an's heart sank.

"What kind of poison is this?"

He would have the physician check his pulse every ten days, but the physician couldn't tell anything was wrong.

"This pigment contains indigo, a poison synthesized from plants, cow blood, and minerals that easily vaporizes when heated."

Xiao Qingyin explained.

"Small amounts of toxins can cause shortness of breath, chest pain, dizziness, and coughing, while larger amounts can cause symptoms such as nausea, vomiting, coma, and abdominal pain."

Marquis Yong'an recalled that he had indeed been feeling dizzy for the past two weeks. The imperial physician said that he might have been staying up too late and advised him to rest early.

I never expected it to be poisoning.

Princess Zhaoyang received the prescription and immediately ordered her servants to prepare and brew the medicine.

He then asked Marquis Yong'an, "Qingxian, where did you get this blue pigment?"

"It was auctioned at the Treasure Pavilion."

"The Marquis of Yong'an said in a deep voice."

He was a regular at the Treasure Pavilion, having bid on and sold many items, but this was the first time he had suffered such a huge loss.

"Someone, please bring the young master here."

After Yi Shuihan arrived, Marquis Yong'an told him what had happened.

"...This is no accident; it's aimed at me and your mother."

Many people know that Princess Zhaoyang liked the color blue, and it is also well-known that she loved collecting blue pigment.

He happened to be able to buy such a unique can of blue pigment.

The pigment also happened to be toxic.

There's no such thing as a coincidence in the world.

Yi Shuihan immediately led his men to surround the Treasure Pavilion and captured the manager.

"Your Highness, Lord Marquis, I have been wronged!"

The shopkeeper immediately protested his innocence.

“We tested this pigment, and you tested it too, and neither of them tested positive for toxicity. We really didn’t know it was poisonous.”

"Who brought this to auction?"

“A down-on-his-luck scholar, whom I didn’t recognize, said he had accidentally discovered the pigment. I, a humble citizen, thought the color was novel and unique, so I put it up for auction.”

Where is he/she?

"He took the silver and left; we don't know where he went."

Yi Shuihan reported this to the Jingzhao Prefecture, asking them to send people to investigate. They posted the portrait of the scholar the shopkeeper mentioned everywhere, but they still couldn't find him.

The trail went cold.

Xiao Qingyin returned to the Yun residence while Yi Shuihan went to arrest people.

She carried the pig that Princess Zhaoyang had given her.

There was no pigsty at the Yun residence, and she didn't want to raise pigs, so she rushed back and found a butcher to come and slaughter the pigs.

After a busy afternoon, I marinated it with seasonings, made it into cured meat, and hung it under the eaves.

Looking at the corridor full of meat, I felt like I belonged to a wealthy family.

"Wow~ Wow~"

The eagle owl, having had a good sleep, flew out of the room and called out to Xiao Qingyin.

Han was startled by its sound.

"Why is there a harbinger of doom here? This is very unlucky, get it out of here quickly."

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