Search:

I'll add that Shigeyoshi Iwasaki also puts back into his community, he teaches young smithys his skills. He has also passed on his knowledge to developing countries,
a very noble thing to do.

Hides Export is a great blog, he also talks to Iwasaki San about his honing methods and also talks with Iizuka San (student of Iwasaki) of Shigefusa knives.

I believe the Tamahagane used by Iwasaki was from ancient Tamahagane.
　Hide's Export　　: Iwasaki and Tamahagane

A good read too

Hitachi Metals>Tale of tatara>Tama-hagane and the Japanese sword