If you want to get saltpeter, besides collecting it from toilets or old houses, this is the most effective source in ancient China.

From this point of view, China's invention of gunpowder was a historical necessity, because the raw materials were naturally produced.

Without raw materials, technology will not progress and related products will not appear.

Just like China invented glass during the Warring States Period, it lacked the necessary natural raw material of sodium carbonate, which was called trona in ancient times. There was a lot of it in the arid desert areas of the Middle East, but there was very little in China with abundant rainfall, so China had to use its output.

Rich clay was used to fire porcelain instead.

At the same time, since steel-making blast furnaces appeared in the Han Dynasty, which can increase the temperature to 1400 degrees, firing porcelain at 1100 degrees is not a problem.

Until the Middle Ages, the West did not have a blast furnace that could reach the temperature for firing porcelain, so they could only use soda-lime glass with a melting point of about 600 degrees as a substitute.

Therefore, the emergence of products has an extremely complex logical relationship with technology, and they are not born without reason.

Now what Yuan Xi relies on this time is gunpowder made by separating the saltpeter produced from the salt of Heishan Lake.

Of course, because the workmanship is rough and there are many impurities, it is unknown how effective these bamboo tubes can be.
Chapter completed!