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There wouldn't be much of a difference as impurities would already be quite low

Cao Cao, a prominent warlord of the Three Kingdoms period, is renowned for his ambitious rise to power and contributions to the Cao Wei state. His chronic headaches and their treatment by Hua Tuo, a skilled physician of the time, play a crucial role in understanding their historical dynamics. The unexpected outcome of Hua Tuo's avoidance of Cao Cao had far-reaching consequences that impacted both their lives and the realm of traditional Chinese medicine.

The Physician and the Patient

Cao Cao's debilitating ailment, characterized as migraine headaches accompanied by mental disturbance and dizziness, led him to seek relief from Hua Tuo. Hua Tuo's acupuncture treatment, especially targeting the diaphragmatic transport insertion point and the Yongquan (bubbling fountain) acupuncture point on the sole, brought him temporary relief from the excruciating pain. His ability to alleviate Cao Cao's suffering led to his appointment as the warlord's personal physician.

Avoidance and Resentment

Despite the acclaim and trust bestowed upon him, Hua Tuo harbored a resentment for his role as a physician due to......read more

Scraping Together the Raw Materials

In stark contrast to Europe, which enjoyed an abundance of high-quality iron, Japan's geographical limitations meant that the availability of good iron ore was scarce. Japanese bladesmiths had to work with whatever they could find, which was often of inferior quality. Despite these challenges, the Japanese developed a process to create their own steel, known as tamahagane or jewel steel.

Tamahagane was produced through a labor-intensive method that involved smelting iron sand and charcoal in traditional clay furnaces called tatara. This process required an intricate...... read more

source - https://novepeak.com/the-folding-of-japanese-swords-turning-crap-materials-into-masterpieces