In the course of my continuing education in the field of nihonto something has me perplexed. Its Shintetsu or the appearance of Shingane through the jihada. I have seen multiple examples of juyo papered swords with extensive Shintetsu along the entire jihada. For some Den its actually a kantei feature eg for Aoe and Rai schools, with Markus Sesko giving a specific name ie sumigane-hada or namazu-hada, on account of their very thin Kawagane. I have seen a couple of Tanobe sayagaki giving the