著者
野澤 直美
出版者
日本薬史学会
雑誌
薬史学雑誌 (ISSN:02852314)
巻号頁・発行日
vol.54, no.2, pp.77-82, 2019 (Released:2020-07-11)

Gunpowder happened to be produced while seeking the elixir of life. Saltpeter (i.e., potassium nitrate) is an essential substance required to produce gunpowder. There are no saltpeter lodes in Japan. So an aged-soil method called Kodo-hou, which was developed to make saltpeter using the soil from underfloors of houses, was used after guns were introduced. It is not clear where and how this method was invented. The only culture-related method, called Baiyou-hou, was adopted in the Gokayama region of Kaga-han, now Ishikawa. The Edo period was so peaceful that the demand for making saltpeter subsided, and the production technology fell into decline. The Chichibu area, now Saitama, thrived in the production of gunpowder when under the control of Oshi-han. Especially, at the end of the Edo period, much gunpowder was required to defend Edo Bay following the arrival of Admiral Perry. Oshi-han was ordered to defend Edo Bay and bought the gunpowder used from the Chichibu territory. By that time, the materials used for the Kodo-hou method became more available, leading to a familiarized way to make saltpeter. The author succeeded in producing saltpeter applying the Kodo-hou method and using the same material as in the Edo period, confirming the correctness of that material. It was personally experienced how hard it was to make saltpeter in those days. In Chichibu, nearly 400 festivals are held each year, and people set off fireworks as a sign of dedication to not only big shrines, but also small shrines. This suggests that there used to be abundant gunpowder in this area.

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もう少し上品?で高効率な方法として、蚕の糞と草を埋める加賀法というアプローチも。 『煙硝づくりの歴史的経緯と古土法による再現実験の検証─江戸時代の火薬原料製造の実験的検証─』 https://t.co/4lrJ8ue7lx https://t.co/Wm0SwxMLHd

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