Su Fengqing's attitude was not courteous, but he was very thoughtful, he didn't speak casually and perfunctorily, and even bent down to find three stones for them to see.

The ore is on the rock wall in the cave, and when it is knocked down, it is of different sizes, and then the outer layer of dirt is removed, and what is left is black and shiny dark iron stone.

Su Caiyin and the two of them looked at the three stones, and they quickly saw the difference.

One is black with transparency, one is a little chaotic black, and the other is a deep black purple.

"The lighter the color, the lower the purity of the dark iron in it." Su Fengqing saw that they understood, so he put the stone on the ground, "You two might as well try to chop with weapons." ”

When Su Caihe heard this, he was a little eager to try.

took out the black quaint long sword on his waist, and was about to pull out the scabbard, but was stopped by Su Caiyin.

"Use mine."

She handed him her sword.

Su Caihe smiled to himself, how could he forget that his sword was a spiritual weapon, no matter how good the Xuantie was, he couldn't stop his sword, of course it was more appropriate to use his sister's.

"Khooth!"

The results of the three swords with the same strength are obviously different.

The first piece was directly shattered, the second piece had a gap, and the third piece had a shallow white mark.

Because I just look at the effect, I don't use all my strength.

"It's really different." Su Cai and raised eyebrows.

"No matter what kind of quality it is, it must be quenched and purified in the end, and then it can be used as a weapon, such as the sword of Miss Six, which is made of dark iron." Su Fengqing pointed at it and said.

It's the same dark iron, but the sword can split the rough stones of different qualities, which shows that if you want to make a weapon of dark iron, it is not so simple, and the intermediate steps are the most critical.

Su Caiyin and the others nodded.

When Su Fengqing spoke, there was a slight strangeness in his eyes.

The Xuantie Sword is used by the most ordinary people, but anyone with some net worth will use the Heterite Sword. The fifth young master's one is a spiritual weapon, but why is the sixth young lady using a Xuantie sword?

"Thank you Brother Fengqing, just take a look at the rest of us brothers and sisters, and I won't bother you."

Su Caihe returned the sword to his sister and said to Su Feng with a smile.

"Okay, please call me anytime you have anything."

Su Fengqing's eyes flashed, knowing that they might not be so simple when they came this time, but he also knew that he couldn't ask what he shouldn't ask, so he gave up his hand and left by himself.

The workers in the mine were still knocking on the rock wall, making a ding-dong sound, and occasionally the rubble would splash away, Su Caihe and Su Caiyin glanced at each other, and the two moved towards the middle of the mine.

With his back to the worker, Su Caiyin took out the prospecting ball and urged it with the internal force on his body, and the white crystal ball began to glow.

The color is very light, with a grayish black flickering.

Iron ore is divided into four types from low-level to high-level, the lowest is dark iron, and the appearance of prospecting balls is black; followed by hematite, which is red; red gold iron, golden red; Finally, there is Jin Yaotie, bright gold.

The brighter the color, the better the quality.

The black color that appeared now was the mine here, and they needed to find the hematite.

The two of them explored while walking, and Su Caiyin felt the prospecting ball with his internal force, always staring at its changes.

Soon out of the mine, because of the distance, the prospecting ball has returned to its original white.

Wulipo is not big, out of the mine they just turned around, almost around the mine cave walked a big circle, seeing that they were about to go out of the Su family's range, they finally made a discovery.