Start with a blacksmith shop.

Li Zhenhua rummaged through the house, remembering that he had packed away all the things he needed before leaving for school.

He quickly found several sealed containers of liquid. Through the plastic containers, he could see that the liquid inside flowed very slowly as he moved them.

Li Zhenhua carried out a bucket, opened the lid, and looked inside.

The bucket contained a black, viscous liquid. Li Zhenhua examined the contents of the bucket.

Finding no problems, he nodded in satisfaction and carried the two buckets of liquid out of the room.

Returning to the stove, next to which was a rectangular iron water tank.

There was nothing inside at the moment. Li Zhenhua opened a bucket and poured the contents into the sink.

Just as Li Zhenhua was about to pour in the second bucket, his analytical eye gave him another hint.

A notification appeared in his field of vision:

A mixture of diesel fuel and engine oil can be used as a coolant for steel quenching.

The current ratio of these two is not optimal; please continue adding engine oil.

This suggestion made him realize that having the analytical eye was truly a great benefit.

Even with a simple question about quenching coolant, this eye can provide the optimal ratio.

Li Zhenhua returned to the room and took out another 2L red bucket, which contained engine oil.

This was waste engine oil that Li Zhenhua had gotten from a repair shop in town.

It was only because there was nowhere to dispose of the waste engine oil at the time that Li Zhenhua was able to take it away.

If this were today, there would be nowhere to dispose of all this waste engine oil.

Returning to the sink, Li Zhenhua unscrewed the lid of the small bucket.

Then he started pouring waste engine oil into it, while his eyes were constantly giving him hints.

『机油差值：1200ml、800ml···100ml、40ml、1ml。

The engine oil is too high. Please add diesel fuel. Current diesel fuel level: 2ml.

They poured too much, which caused them to miss the optimal ratio.

I added a little more diesel fuel to it, just in case I poured in too much.

Finally, Li Zhenhua adjusted the coolant ratio to the optimal level.

With the quenching equipment ready, all that remained was the actual operation. Li Zhenhua returned to the furnace and took out the blade blank.

Judging from the clues provided by the eyes, the temperature of the blank was slightly too high at this point.

Li Zhenhua could only stand there with the blade blank in his hand, waiting for the temperature to drop, and he was also ready to insert the blade blank into the quenching coolant at any time.

The temperature finally dropped to the optimal level, and Li Zhenhua, without any hesitation, plunged the blade blank directly into the coolant.

The coolant in the tank caught fire. Along with the flames, the air was filled with the smell of burning fuel.

"Please take out the blade blank. Countdown: 10 seconds, 3, 2, 1."

Li Zhenhua immediately took out the blade blank, which didn't look very good after being quenched.

The surface of the blade blank was dull and extremely unsightly.

Li Zhenhua carefully examined the blank knife in his hand, and just then, words appeared next to the blank knife.

"Watermelon knife (semi-finished product)"

Length: 430mm, Width: 45mm

Total weight: 750g, hardness: 62

Toughness: Tempering incomplete; this data is incomplete and requires further tempering.

Li Zhenhua didn't expect that he just wanted to test another of his loading completion functions.

However, ever since he forged this watermelon knife, things have taken an increasingly unexpected turn.

If this watermelon knife was indeed completed according to the prompts from the Eye of Analysis.

Let alone killing a watermelon, this watermelon knife would be a piece of cake. It's probably of better quality than the small daggers sold in the market.

Li Zhenhua also wanted to know what he would end up doing with the watermelon knife.

Therefore, Li Zhenhua planned to strictly follow the instructions from the Eye of Analysis.

"Next, please prepare the tempering solution. Raw materials: diesel oil and engine oil."

Li Zhenhua followed the instructions precisely and prepared the tempering solution.

Li Zhenhua, a blacksmith by trade, naturally knew how to temper the metal. He took out a rectangular bucket and poured the solution into it.

Then he squatted on the stove and carefully controlled the fire.

Until the temperature of the solution is heated to near its ignition point.

Li Zhenhua maintained the temperature and fixed the blade blank to the solution tank with iron wire.

Then came a long two-hour wait, with the blank placed in the solution and kept at 220 degrees Celsius for more than two hours.

Li Zhenhua finally took him off the stove.

The next step is to wait for the blade blank to cool slowly in the solution.

Once the blank has cooled to room temperature, the tempering process is considered complete.

Quenching gives the blade blank hardness, while tempering gives it toughness—this is how a watermelon knife is made.

Li Zhenhua was instructed to produce it directly using weapon-grade methods.

It got dark while Li Zhenhua was keeping the watermelon knife warm, and he didn't intend to keep watch any longer.

Instead, he left it there to cool down naturally. The sun set, and it was time for Li Zhenhua to eat again, but for him, the day's experience had been nothing short of magical.

He only sold a sickle, but somehow ended up with a cheat code for himself.

Li Zhenhua used his chopsticks to pick up a large mouthful of noodles and put it in his mouth.

"It seems I'm destined to be a blacksmith for life. If I stop being a blacksmith, I feel like this cheat code will leave me immediately."

After finishing his meal, Li Zhenhua walked to the furnace and looked at the blank in the tempering solution.

The dialog box in the eye shows the temperature of the blank as 43℃.

Seeing this temperature, Li Zhenhua knew that it was time to take it out of the solution.

Put on gloves, grab the wire hanging on the side of the bucket, and fish the knife out of the bucket.

The blade was covered in a mixture of oil and water. The blade blank was placed on a pre-prepared rag, and the rag was used to wipe off the solution.

The color of the knife blank appeared before Li Zhenhua's eyes; it was still that silvery-gray color, and somewhat dull.

Li Zhenhua looked at the prompt in his eyes.

"Watermelon knife (3/4 finished product)"

Length: 430mm, Width: 45mm

Total weight: 750g, hardness: 62

Toughness: Good (This value is complex and the specific value is not quantified at this time).

The blade blank is now forged; the next step is to shape it into a V-shape and sharpen it.

With the assistance of machines, these two procedures have become much easier for blacksmiths.

However, it is still quite difficult to do these two processes well and reach the level of being able to cut hair with a blower.

Li Zhenhua went to the table next to the anvil and placed the knife blank on it.

He originally intended to use calipers to find the center of the blade, draw a line, and then use the belt sander to make a V-shape.

But the analytical eye proved its worth once again.

Li Zhenhua no longer needed to draw lines. He walked to the belt sander and clamped the blank in the fixture.

Li Zhenhua turned on the machine by hand, and the belt sander started to rotate. He then used a clamp to feed the blank into the belt sander.

When the blade blank comes into contact with the belt sander, the friction between the belt sander and the blade blank generates a lot of iron filings and sparks.

The blank knife gradually took on a V-shape in Li Zhenhua's hands, and it became more and more like a real knife.

Once the eye indicator appears, the high-waisted flat grinding and V-shaped edge is complete. The next step is manual second-sharpening.

After completing this step, the watermelon knife is no longer the same color as before. When opening the V-shaped opening, the belt sander has already ground out the color of the steel.

It has now turned half bright silver, but the remaining part that hasn't been opened is still the original color.

Li Zhenhua took the blank knife to a corner of the yard, where a long bench was placed.

There was a millstone embedded in the bench, which was said to be older than him.

Li Zhenhua straddled the stool and began to sharpen the knife little by little.