Daming: The system rejected my request for salted fish

Hearing this answer, Zhu Yuanzhang nodded and stopped asking questions. He stood quietly aside and waited.

Wei Wu reached out and opened the lid of the iron barrel. In an instant, a slightly pungent smell wafted out.

Then Zhu Yuanzhang and Zhu Biao looked into the bucket and saw that the iron bucket was filled with dark green viscous liquid.

As an emperor, expensive pigments were nothing to Zhu Yuanzhang, and he had seen many high-end and bright pigments.

Just from the naked eye, the texture of those paints cannot compare to the liquid in this bucket.

Just when the two were curious about what was so special about this color-changing ink, Wei Wu took action again.

He took a piece of white paper from the table and spread it flat, then stretched out his finger and gently dipped it in the green liquid.

Then, he placed his finger on the white paper and drew a stroke very casually.

Because it was in the back hall of Fengxian Hall, the lighting inside the room was not very good, and Zhu Yuanzhang did not see anything strange about it.

But at this time Wei Wu grinned.

"Okay, you're done!"

Upon hearing this, Zhu Yuanzhang looked at Wei Wu with a puzzled look on his face and asked:

"Is this it? But the ink hasn't changed color!"

"Of course you can't see the color change now, but you will be able to see it later."

Wei Wu smiled mysteriously, then picked up the paper and left Fengxian Hall with Zhu Yuanzhang and Zhu Biao.

After leaving the hall, Wei Wu looked at the sun in the sky and then handed over the paper.

"Uncle Zhu, big brother, please shake this piece of paper towards the sun and see if the colors on it look good."

Zhu Yuanzhang and Zhu Biao looked at each other, and then Zhu Yuanzhang reached out and took the paper.

But as soon as he took the paper in his hand, he found something wrong.

"Hey! Xiao Wu, you were clearly painting green just now, how come it's turned purple and gold now?"

After hearing what Zhu Yuanzhang said, Zhu Biao, who was standing opposite him, frowned.

"Dad, you must have seen it wrong. The painting on this paper is clearly green, there is no purple or gold!"

Upon hearing this, Zhu Yuanzhang glared and said something unhappily.

"Why, are you saying that your father's eyesight is so bad that he can't even distinguish colors?"

"That's not what my son meant, but what he saw was clearly green!"

After hearing Zhu Biao's answer, Zhu Yuanzhang wanted to talk to him immediately, but at this time Wei Wu spoke.

"Uncle Zhu, big brother, don't be so anxious, why not switch positions first and then see its color."

After all, Zhu Biao was younger and his brain reacted much faster than Zhu Yuanzhang's.

Wei Wu had just finished speaking when a look of sudden enlightenment appeared on his face.

"Xiao Wu, could it be that the characteristic of this color-changing ink is that its color changes differently depending on the orientation?"

"That's right!"

Wei Wu nodded, agreeing with Zhu Biao's answer, but still added a sentence.

"But instead of changing its position, if you adjust the angle in the sunlight, it will turn into another color."

"Because this ink is a mixture of purple, gold and green, the color Mr. Zhu sees is different from what you see."

After hearing Wei Wu's explanation, Zhu Yuanzhang and Zhu Biao immediately became very interested in the color-changing ink.

The two of them tore the paper into two halves, each holding one half and playing with it happily in the sun, exclaiming that it was magical.

But just when the two were having fun, Wei Wu suddenly started talking about serious business.

"Uncle Zhu, tell me, if we use this ink as an anti-counterfeiting measure, who in the world can forge silver notes?"

Hearing Wei Wu's voice, Zhu Yuanzhang put the paper in front of him again to check.

After pondering for a moment, he shook his head and responded:

"It's impossible to forge it, but Xiao Wu, what if the formula of this color-changing ink is leaked?"

After Zhu Yuanzhang finished speaking, Wei Wu immediately laughed.

"Recipe? Uncle Zhu, you know my special ability. I can receive something every once in a while."

"This color-changing ink is what I received. It was something that existed in my time, but even in my time."

"Only professionals can make this stuff. I don't even have the formula, let alone leak it."

When Zhu Yuanzhang heard that there was no formula for the color-changing ink, he was not happy but frowned instead.

"There's no formula, which means we can't mix the color-changing ink. That makes it difficult to make banknotes."

"As far as I know, the things you can obtain with that ability are limited in quantity. What if we run out of them?"

It must be said that Zhu Yuanzhang's concerns were justified, but Wei Wu patted his chest and assured directly:

"Don't worry, Uncle Zhu! I have quite a few of these things, which are definitely enough for us to use."

This is not Wei Wu bragging, because he took this thing out of the container and the inventory is fully guaranteed.

But after Wei Wu finished explaining, Zhu Yuanzhang was still worried and said:

"If you can't allocate it yourself, even if you get a lot, it will eventually run out!"

After Zhu Yuanzhang finished speaking, Wei Wu did not give an answer, but asked a question in return.

"So if it takes a hundred years to run out, do you still need to worry about it running out?"

"And even if they run out, I guarantee that the Institute of Science and Technology will be able to develop other anti-counterfeiting methods within this hundred years."

Zhu Yuanzhang was still very confident in the Academy of Science and Technology, but he was still a little surprised when he heard Wei Wu's words.

"It can last for a hundred years? You got so much?"

“Maybe not as much as you think, but you have to know that we can actually use less than you think either.”

In fact, Wei Wu had already thought about this carefully. According to his speculation, it would never be used up.

Zhu Yuanzhang looked at Wei Wu and did not continue speaking, because he knew that Wei Wu would definitely give a satisfactory answer.

In fact, this is indeed the case. Under Zhu Yuanzhang's gaze, Wei Wu slowly said:

"Uncle Zhu, I guess what you're thinking of is using this color-changing ink to print banknotes, but we don't need to do that."

"The purpose of the color-changing ink is to prevent counterfeiting. As long as the color change effect can be seen in sunlight, there is no need to use it on the entire banknote."

As he spoke, Wei Wu raised his hand and pinched half a finger on his little finger with his thumb.

"We only need to print a large Ming character on the banknote. A finger-sized one should be enough, right?"