Hearing this, Shi Yiqing hurriedly stepped forward and stood under the black cotton cloth with Su Jiudong to look up. I saw that the sunlight penetrated the cotton cloth, revealing dense handwriting on the cotton cloth.

Su Jiudong looked at the cotton cloth penetrated by the sun, then looked at Shi Yiqing, and asked confidently: "Lord Shi, can you see what is in this cotton cloth?" ”

Shi Yiqing tried hard to identify, but he saw the clear handwriting on the cotton cloth, as well as the familiar Wanyin pawnshop mark, and immediately exclaimed: "This! There's handwriting on it! There is also the mark of Wanyin Pawnshop..."

Shi Yiqing couldn't help but step forward and get closer, his eyes narrowed slightly to carefully identify the handwriting on the cotton cloth, and sure enough, he saw the words on the bill, and even the content and name of the pawn were clear, and he was surprised: "This should be the handwriting on the deposit bill?!" ”

"Yes, it is indeed the mark of Wanyin Pawnshop and the handwriting of the deposit receipt." Su Jiudong had already seen those clear versions of himself in his eyes.

"But why is there a mark and handwriting on this cotton cloth?"

Shi Yiqing was surprised and surprised: "Could it be that the ink is too thick when writing, and the ink is printed directly on the cotton cloth padded under the paper?" But with such a concentration of ink penetrating the paper, the paper has long been soaked with thick ink and can no longer be used..."

Wen Yiheng stepped forward at this time, took the cotton cloth in Su Jiudong's hand, held it high above his head in the sun, raised his eyes and stared, and sure enough, he saw that the black cloth was covered with handwriting written in grease: "It's not ink, it's made of grease." ”

Just now, Shi Yiqing risked trespassing and disclosed the truth about the corruption of the county officials to Wen Yiheng, and now it is Wen Yiheng's turn to reveal the reason why there is handwriting on the cotton cloth:

At that time, the prime minister was struggling with how to make those rich people spit out the money, so Miss Su offered advice in time. After the two of us discussed, we finally decided on the plan for this inkstone cotton. ”

"In the whole plan, the most conspicuous thing seems to be the square inkstone, but the most important thing is this cotton cloth."

Wen Yiheng folded the cotton cloth and put it away, and explained to Shi Yiqing while leading the two back to the study:

"That Duan inkstone is indeed a high-grade inkstone produced in Duanzhou, which is no different from the general Duan inkstone, and the words written are not soaked in water without diverging and fading. It is really not the effect of Miss Su's condensation boasting to Yinjigui as the head of the mountain show. ”

Before Shi Yiqing had time to re-sit down, he hurriedly said: "Since the ink from the inkstone has no effect of condensing words, but Na Yinji said that he saw with his own eyes that the ink is still solidified and not diverged after encountering water for a long time, and even appears more clearly. ”

"There's another hidden story." Wen Yiheng said with a smile: "As for why there was an effect of condensing words later, it was because Miss Su did something on the inkstone and cotton cloth. Regarding this point, let's ask Miss Su to talk to Master Shi. ”

Su Jiudong invited Shi Yiqing to take a seat, pushed the tea to Shi Yiqing's hand, smiled and said softly: "The little girl knew earlier that grease and water were incompatible, so she planned to use fish fat to make hands and feet for the inkstone this time. ”

Shi Yiqing asked diligently: "Why is it not ordinary fat, but fish fat?" ”

Fats and fats are cheap and can be found everywhere, while fish fats are much more expensive than ordinary fats because they need to be cut by hand.

Su Jiudong blinked: "Lord Shi doesn't have to worry for the time being, this reason will be mentioned by the little girl in the future, and at this time, let the little girl sell it first." ”

Shi Yiqing realized that he was too curious, eager to know the whole reason and what happened, and lost his temper in front of Wen Yiheng and Su Jiudong, and then showed a helpless and guilty smile.

The little girl placed the inkstone found by Wen Xiang's order to soak it in fish fat for more than an hour, took it out to dry, then soaked it again, and then took it out to dry. This cycle is repeated ten times for a total of ten times to allow the fish fat to penetrate the surface of the inkstone. ”

Speaking of the number of times, Su Jiudong couldn't help but think of Wen Yiheng staying up all night to accompany him to repeat the test many times, and it took almost two days to finally come to the conclusion that it took ten times to soak and dry to achieve the effect.

Su Jiudong couldn't help but glance at Wen Yiheng deeply, his eyes were full of gratitude and gratitude. And Wen Yiheng's gaze back to Su Jiudong was full of love.

Su Jiudong's mind instantly remembered the conversation between the two at that time.

Su Jiudong said: "Actually, you don't have to spend time here with me, you can go and rest first." Now that the residual poison in your body has not been removed, you must also take care of the arrow wounds on your body to prevent recurrence, and it is estimated that it will be another vicious battle after returning to Beijing, and the top priority is to take care of your body. ”

Wen Yiheng replied: "In order to donate money and food for the people in the city, you are united with the people. There is no reason why I should go back to my room and sleep and leave you alone all night to experiment. ”

After speaking, Wen Yiheng gave Su Jiudong a short and warm hug: "Your experiment is for the disaster victims, and I stayed up all night purely to accompany you, that's all." "Worry-free love book network

Shi Yiqing didn't notice the eyebrows between Wen Yiheng and Su Jiudong, he only seriously thought about the possibility of Su Jiudong's operation, and said to himself with great interest:

"No wonder there is a handwriting on the cotton cloth with silver deposit notes, which should be the result of fish fat insoluble in water."

Su Jiudong put away the funny mood of secretly sending Qiu Bo in front of Wen Yiheng, and immediately returned to a calm and indifferent appearance, and replied: "That's right, fish fat is insoluble in water, and the handwriting written with ink from an inkstone soaked in fish fat will naturally have oil. ”

In addition to working on the inkstone, the little girl also made a mess of cotton. Just put a piece of ordinary cotton cloth on the fire to evaporate the moisture of the cotton cloth itself, and let it sit until the cotton cloth becomes extraordinarily dry. ”

Shi Yiqing couldn't help but recall the words when Yin Jigui described the situation to him: "I remember that Yin Jigui did say that he touched the cotton cloth, and it was indeed an ordinary cotton cloth, but it was drier and more obscure than the usual cotton cloth. Now it seems that there is a doorway in it. ”

Su Jiudong nodded: "It is precisely because of the dryness of this cotton cloth that the grease can be left and firmly locked from diverging." ”

"When people write, the force penetrates through the back of the paper, the grease penetrates through the paper into the cotton cloth under the paper, and the moisture of the ink is absorbed by the cotton cloth that is usually dry, and only the grease remains, so that the traces on the grease cotton cloth can be better left."

"After half an hour, the ink will dry, and even if you soak it in cold water, the ink will not diverge. This is the reason why when the little girl demonstrated the condensation in the water for the hidden return that day, the ink on the paper did not disperse or fade, but became clearer. ”

After listening to Su Jiudong's explanation of the real reason why the handwriting condensed and did not diverge, Shi Yiqing only felt like an initiation, and deeply felt Su Jiudong's whimsy.

"In this world, there will be no inkstone and ink that can really condense the words, everything is artificial, Miss Su can think of making a fuss from it, and set up a clever plan to make the hidden time take the bait, it is really smart! Xia Guan is deeply impressed! ”

Su Jiudong chuckled when he heard this: "This is just an inducement to lure Yin Ji to take the bait." ”

Shi Yiqing nodded frequently: "Yes, yes, with such an inducement, can Miss Su elaborate more, why can you be sure that you will definitely use this inkstone and cotton cloth?" ”

"It's just a matter of living with oneself." Su Jiudong explained: "Originally, the little girl's family opened a medicinal restaurant, and they can be regarded as businessmen. Occasionally, when a guest eats without cash, the practice of making a white slip on credit is based on a written note. ”

"As the head of the house, I have to ask the guests for the meal with the written note, and I naturally hope that the handwriting will not be returned. As long as the handwriting does not diverge or fade, it can be preserved for a long time, and no matter how long it takes, you can still find diners to get their meals back. ”

Shi Yiqing nodded in sudden realization, his eyes firmly fixed on Su Jiudong's lips, for fear of missing any key points.

Su Jiudong added: "Besides, the little girl noticed that Wen Xiang approves the fold every day, and every time the approval is completed, it has to be placed aside and wait for the ink to dry before it can be put together. ”

"One is to keep the handwriting for a long time without divergence, and the other is to air dry, it is the little girl who has set the policy of fish fat, and the little girl will definitely use this inkstone after seeing that the inkstone is used to cooperate with the cotton cloth, and the ink written by grinding ink does not diverge and does not fade, and she will definitely use this inkstone."

After Su Jiudong turned to the desk, he planned to give Shi Yiqing a demonstration on the spot. I saw Su Jiudong go straight to the pen to write, the pen walked the dragon and snake, and wrote the big word "Wanyin" on the blank paper. After putting down the pen, the ink on the paper was really not dry, so I could only wait.

Su Jiudong pointed to the ink that had not dried, and continued to explain Shi Yiqing's confusion:

"There are so many pawn bills in pawnshops, and every time a bill is issued, there will definitely be the trouble of waiting for the ink on the bill to dry and dry. Therefore, the little girl concluded that Yinjigui would definitely use this inkstone and cotton cloth to re-transcribe the previous deposit notes. ”

Su Jiudong smiled at Shi Yiqing, and said in a profound tone: "Didn't Lord Shi ask why he used fish fat as a guide just now?" Then comes the time to solve the mystery. ”

"At that time, after the little girl pawned, she had privately told Yinji Gui that after writing the note, the paper should be exposed to the sun to make the ink condensation effect better." This is a point that Yin Jigui has never mentioned to Shi Yiqing.

"As everyone knows, when the paper that has been written with this inkstone and cotton cloth is exposed to the sun, the ink stained with fish fat on the paper will volatilize, and then attract all the wild cats in the city who have been hungry for a long time."

Shi Yiqing already understood the reason, and while listening to Su Jiudong's statement, he turned into an emotionless nodding machine: "I see, this fish fat is a pre-set means to attract wild cats in the end. ”

Su Jiudong smiled calmly: "That's right, this is exactly the means conceived in combination with the current drought in the city, now that the city has been in drought for a long time, the people are starving, and the small animals are also lacking in food, so they will definitely go out to find food to feed their stomachs." ”

"The wild cats who used to rely on 'petty theft' to eat their stomachs have been empty for a long time because of this drought, and when they smell fishy smell, they will come up and mistakenly tear the paper as food and eat it."

After speaking, Su Jiudong tore the paper to shreds, and the word "Wanyin" suddenly turned into pieces.