Although You Tingrong was in an inquiring tone, she already had the answer in her heart, and her expression was more clear and sarcastic.

According to the ancient method, the firing method of charcoal can be divided into two kinds, one is the kiln firing method, in which wood is put into a clay cave and ignited, and when the wood is burned to a certain extent, the kiln mouth is sealed, and it can be made into charcoal after a day or two.

The other is the dry distillation method, which requires the wood to be placed in the dry distillation kiln, and only a small hole is left in the kiln first, and it has to be burned continuously for several days in a row, and it has to be cooled for a day or two before it can become charcoal.

And the charcoal that You Tingrong said is formed by people casually burning all the firewood, and it becomes black ash when it is lightly twisted, even if it is put in an urn and carefully preserved, it can only burn for two hours at most.

"After Rebirth, the favorite concubine doesn't want to enter the palace" Chapter 659: Prepare for the drive, go to the Zichen Hall is in the middle of the hand, please wait a while,

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