Therefore, controlling the heat is very important, especially when refining high-level elixirs; you will realize how crucial the control of heat is. Because the refinement of high-level elixirs does not allow for any mistakes; the temperature of any type of heat must be minimized within an acceptable range.

Generally speaking, there are four types of heat: Strong Fire, Medium Fire, Slow Fire (Low Fire), and Low Fire.

Strong Fire is used to evaporate moisture or melt solid materials, like the hard material Spirit Stone.

Medium Fire is typically used to refine neutral medicinal herbs, which are somewhat hard but not very hard; they have medicinal properties but are difficult to extract.

Slow Fire is used to stew and decoct medicinal herbs; it is also the required heat for some elixirs that have a longer refinement period.

Low Fire is used to refine materials that are easily volatile, flammable, and meltable.

?However, although there are only these four types of heat, if the temperature is to be subdivided, it can be divided into thousands.

During alchemy, the temperature changes with the medicinal herbs; each type of herb has its specific refinement temperature; therefore, these four types of heat are too general and have a wide range.

Thus, an alchemist must tailor their approach to the materials; when refining each type, or a few types of medicinal herbs, they must use the corresponding temperature for these herbs to refine; only then can they produce high-quality elixirs.

Peach Blossom Valley Venerable ignited a fire in the pill furnace's fire pit out of nowhere, letting Lin Yifan control the fire.

"Slow Fire!"

Since Lin Yifan possessed cultivation power, he did not need to personally go over and draw out a torch to adjust the temperature.

He could stand at a distance, utilizing his cultivation power to control the heat.

The next moment, he began to use his cultivation power.

The temperature of the Slow Fire is very low, but the flame was very strong at that time, so he had to bring the flame down.

Lin Yifan's cultivation power acted like a fire extinguisher, quickly lowering the flame. The next moment, the temperature of the flame under the pill furnace reached the range of the Slow Fire.

Upon sensing that Lin Yifan had achieved Slow Fire, Peach Blossom Valley Venerable immediately changed the test, "Strong Fire!"

At that moment, Lin Yifan immediately transformed his cultivation power, making it act like a catalyst, intensifying the fire. In an instant, the Slow Fire turned into Strong Fire.

After that, Peach Blossom Valley Venerable tested Lin Yifan's adjustment of the Medium Fire and Low Fire.

Lin Yifan adapted accordingly, managing to regulate both these heats.

Regulating these four types of heat is the most basic task; if one can't even regulate these four types of heat, then they shouldn't be an alchemist.

Next, Peach Blossom Valley Venerable began to test Lin Yifan's real ability to control the temperature of the fire.

"The refinement temperature of the Mysterious root."

The Mysterious root usually needs around forty degrees to extract its medicinal properties, so Lin Yifan quickly regulated it.

"The refinement temperature of Purple Perilla Vine."

This one Lin Yifan also knew well, so he quickly regulated it as well.

"The refinement temperature of the Seven Fragrance Insect."

This one... Lin Yifan did not know, because it seemed he had never used the Seven Fragrance Insect to refine elixirs before.

Thus, he sincerely responded, "I apologize, Venerable, I don't know this."

Peach Blossom Valley Venerable was somewhat disappointed, having not expected that Lin Yifan did not even know the basic temperature for a single herb; what would he do if the test was about the temperature for mixed herbs?

"I hope this is just an isolated case."

Thus, filled with anticipation, Peach Blossom Valley Venerable posed another question,"The refinement temperature of Thousand Frost Grass."

"Thousand Frost Grass? Is there such an herb?" Lin Yifan questioned.

He had studied ancient and modern texts on herbs and had never come across this herb, thus he did not know its refinement temperature.

He truthfully responded, "I'm sorry, Venerable, I have neither seen nor heard of this herb, so I don't know."

Lin Yifan failed to answer again and Peach Blossom Valley Venerable felt extreme disappointment; he couldn't help but angrily ask, "Aren't you a mid-high level alchemist? How can you not be familiar with the refinement temperatures of so many herbs?"

Lin Yifan felt very innocent; although he was a mid-high level alchemist, he had only refined three types of elixirs, involving limited herbs, so he was not familiar with the refinement temperatures of many herbs.

"Venerable, to be honest, I have only refined a limited variety of elixirs, so I am unfamiliar with the refinement temperatures of many herbs; moreover, there are many herbs I have never even heard of, let alone be familiar with," Lin Yifan responded, "However, if you could recite all the herbs' refinement temperatures for me, I guarantee I could adjust to each one."

After listening to Lin Yifan's explanation, Peach Blossom Valley Venerable finally understood the reason. Lin Yifan had an eidetic memory, and he believed that if given all herbs' refinement temperatures, he would definitely remember them well and thus could easily adjust them accordingly.

Actually, the refinement temperature of a single herb was not a difficulty for Lin Yifan, it was only the temperature of mixed herbs that truly tested him; thus, Peach Blossom Valley Venerable recited all the herbs' refinement temperatures to Lin Yifan.

Lin Yifan listened attentively, earnestly memorizing the refinement temperature of every herb mentioned by Peach Blossom Valley Venerable.

At that moment, his brain acted like a storage device, storing copious amounts of information; when needed, he knew it instantly.

Eidetic memory was not only about visuals, but auditory information could also be remembered. After all, once information appeared in his mind, he could not forget it.

There were thousands of herbs, so Peach Blossom Valley Venerable spoke for two hours to finish them all.

If it were an ordinary person, they would definitely be exhausted, gasping, and hoarse; however, Peach Blossom Valley Venerable was not affected at all, remaining calm and effortless.

When Peach Blossom Valley Venerable finished, Lin Yifan had remembered everything. Now, if Peach Blossom Valley Venerable were to ask him the refinement temperature of a single herb, he would definitely be able to adjust it quickly.

However, often things don't go as one wishes; thus, Lin Yifan was destined to brainstorm further.

"The refinement temperature when mixing Jinlian and Purple Perilla Vine," Peach Blossom Valley Venerable inquired.

This was the herb mixture needed for the healing pill refinement that Lin Yifan had not made before, so he was utterly baffled now.

However, since the refinement temperatures of Jinlian and Purple Perilla Vine were very close, Lin Yifan thought he should take the average of both, and so he immediately adjusted to this temperature.

"Venerable! How was it? Did I adjust it correctly?" Lin Yifan asked uncertainly.

"Hmm! Correct!" Peach Blossom Valley Venerable replied indifferently, without any joy.

Lin Yifan was lucky this time, but it did not mean that the refinement temperature of all mixed herbs should be the average of their individual temperatures; thus, he changed his approach and posed other questions to Lin Yifan.

"The refinement temperature when refining Luoma with Fragrant Maple Grass together."

Upon hearing these two herbs, Lin Yifan quickly came up with an average temperature.

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