Hello all!   So, I am a tsuba guy!  But I was doing research on the possibility of cast iron tsuba (long story!) and I stumbled across this “abstract of an article” about a 2000-year-old cast iron Japanese sword.   I don’t know, I thought maybe some of you may find it of interest (or maybe not!).  Oh well, here is the abstract of the article-   From the website-   https://link.springer.com/article/10.1557/opl.2012.630   “Long-Term Corrosion of 2,