Looking at the disbelief on the faces of the two old fellows beside him, Li Chengqian had no other choice.
He could only wait for the truth to speak.
Buckets of clear sugar water were filtered out.
A fire had already been lit under the big pot, and the sugar water was poured into the pot to heat up.
It was true that Second Emperor Li cared about the people's livelihood. Otherwise, he would not have known the price of stone honey on the market.
However, he only knew how it was, but he did not know why.
For example, Old Li knew nothing about the production method of sugar.
Therefore, when he saw Li Chengqian's series of actions, he revealed a blank expression.
As for his cheap uncle Zhangsun Wuji, it was obviously the same. He didn't know what it meant to heat up the sugar water.
The two of them were actually very curious at the moment, but they were too embarrassed to ask. They could only stand at the side and watch foolishly.
"Don't heat the fire under the big pot too much.
When he saw white crystals forming inside, he reduced the fire volume again.”
Li Chengqian busied himself in an orderly manner and did not show any signs of panic.
White crystal?
Old Li was stunned when he heard his little rascal's words.
"Isn't it still sugar water after heating it? How could a white crystal appear?
This little rascal is so mysterious. Is he trying to make us happy with all these messy actions?”
Thinking of this, Old Li suddenly felt like he was a muggle.
If this brat didn't come up with anything after all this time…
If he and Zhangsun Wuji had been waiting here, wouldn't they have been standing here foolishly for half a day?
Old Li's heart skipped a beat. He felt that his little rascal might really do such an unscrupulous thing.
"Cough cough, Wuji, let's go sit at the side and wait.
I don't believe that this brat can make candy better than stone honey!”
However, just as he finished speaking.
Zhangsun Wuji did not nod in agreement. Instead, he revealed a shocked expression.
"Your Majesty, this…this iron pot really has that white…that crystal!”
Was this for real?
Was he that godly?
Old Li didn't believe it at first.
However, Zhangsun Wuji had a good reputation, so he obviously wouldn't lie to people like the little rascal.
Therefore, Old Li also went over to look at the iron pot.
What surprised him was…
In the iron pot filled with sugar water, there were really tiny white crystals that kept emerging.
This miraculous process was like creating something out of nothing.
"What…what is going on? Is this what sugar is?"
Old Li was surprised and confused.
In his mind, the sugar water would still be sugar water after being heated.
Unless the water was boiled dry, it would turn into syrup.
However, the scene in front of him was completely different from what he had imagined.
This was because there was still a lot of water in the iron pot, but crystals kept appearing.
Of course, Li Chengqian also heard the two people's surprised cries and walked over to observe the situation.
The fire under the iron pot was reduced once again, and the speed at which the white crystals were forming increased.
Gradually, the bottom of the iron pot was covered with a layer of snow white.
The appearance of this scene made the surrounding people feel incredulous.
Even a fool would know that the snow-white layer at the bottom of the pot was obviously sugar.
Furthermore, it was a snowflake-white candy!
One had to know that even the frosting that could be used as a tribute from the stone honey might not be as white as this!
"Chengqian, is this the sugar you mentioned?”
This time, before Old Li could speak, Zhangsun Wuji could not help but ask.
Li Chengqian nodded and casually said,"
"That's right! Uncle and Imperial Father saw it just now. This is how I refine sugar.”
"But…but why is the candy so white?”
Zhangsun Wuji asked in disbelief.
Old Li was obviously very curious about the answer to this question. He also looked at Li Chengqian without blinking.
Li Chengqian chuckled softly and said,"
"Uncle, I filtered out all the impurities in the sugar water.
Of course, the candy that was made was snow-white. This was not difficult.”
Hiss!
Old Li and Zhangsun Wuji both contributed to global warming.
Because at this moment, both of them sucked in a breath of cold air.
It was not difficult to make snow-white candy.
This was an extremely difficult matter, alright?
Old Li was finally no longer willing to be a silent gourd. He asked in a deep voice,
"Rascal, do you know that the Great Tang now produces mostly cereal-sugar?
The expensive sugar like stone honey was shipped over from the Western Regions by merchants.
I have never heard of anyone who can make this kind of snow-white candy. Do you know how difficult it is…"
Without waiting for Old Li to finish, Li Chengqian directly nodded.
"Your son knows!"
Cough cough!
Old Li almost choked on his own saliva when he heard his little rascal suddenly say this.
However, there was nothing wrong with this brat's words.
If this kid didn't know how difficult it was, how could he make such an unprecedented candy in front of him?
Thinking of this, Old Li spoke again,
"Tell me, why is the sugar you make this snow-white color, and what is the principle behind it.”
"Imperial Father, you…uh, do you really want to hear it?”
Li Chengqian's expression was somewhat hesitant.
Second Emperor Li's old face instantly darkened. He said unhappily,
"What's wrong? Do you want to keep your sugar refining method a secret from me?”
Li Chengqian said helplessly,"
"Imperial Father, you misunderstood. Your son is worried that you won't understand even if I explain it to you. When the time comes, won't you…"
"Kid, just say it. Zhen will listen!”
Old Li's face darkened even more.
What does this brat mean? Is he doubting my ability to understand?
Wasn't it just the principle of sugar production?
How could I, the emperor of the Great Tang, not understand this?
Looking at the confident Old Li, Li Chengqian no longer hesitated and said,"
"Imperial Father, the reason why the stone honey is reddish-brown is that it is a red stone.
It's because there are impurities in it that haven't been purified. After I buy it…
Using charcoal with good absorption effect could absorb most of the impurities.
After that, it will be filtered with a filter cloth to obtain a clear liquid of sugar dissolved…"
Hearing this, Old Li nodded proudly.
He thought to himself, Isn't I listening well? What can't I understand?
At this moment, Li Chengqian continued,"
"In this way, your son obtained a saturated solution of sugar.
At this moment, the solute and the solution formed a stable state…
After heating it to evaporate the water, the saturated solution became a super-saturated solution.
The state was unstable, and crystals began to form…
It was well known that sugar's dissolving rate decreased when the temperature was low.
For example, right now, your son is going to move this iron pot to the side to lower the temperature and increase the speed at which the crystals are forming…"
Old Li, who had a calm expression a moment ago, instantly turned into a dumbfounded state.
Wait a minute!
This was something like a 'saturated solution,' a 'super-saturated solution,' and a 'resolubility'.
What did it mean?
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