"...My thought is that during the time you were asleep, there was another period of sustained heat, which is why even though you placed an extra piece of saltpeter, it still got consumed quickly," Xu Xin speculated.
This was the most reasonable explanation he could think of.
The high temperature would accelerate the consumption of saltpeter, a fact that has been proven by Qi Xuefei's nursery room.
"This..." Li Yajun fell into contemplation.
"Was there a high temperature again last night?" Li Wenxi was somewhat surprised, but then nodded, "That should be it. Otherwise, Yajun being so cautious wouldn't result in such a situation. This weather is too troublesome..."
Normally, the coldest moment in a day is right before sunrise.
That is to say, from two in the morning when Li Yajun fell asleep until sunrise, the temperature should have been steadily decreasing.
By common sense, the three blue-grade saltpeters she prepared indeed shouldn't have had any issues.
