What is Benjin in Japanese Katana terminology?

"ベンジン" or "Benjin" translates to "Benzene" in English. It is an organic solvent used to remove choji oil when it solidifies. Benzene is a colorless and highly flammable liquid with a sweet smell. It is used in a variety of industries, including rubber, dye, detergent, drugs, and plastics. However, it's important to note that benzene is a known carcinogen and should be handled with care.