kinsuji in the Boshi

[Utopianarian]

Need help on the Forum. I remember reading about a Smith whom was known for using Kinsuji in the boshi. I’ve been looking thru my reference books and online but cannot remember or find the reference where I’ve seen it. I was looking at one of the older blades I had polished a few years ago and noticed a streak of kinsuji in the boshi that I can’t believe I never noticed. I don’t think that is commonly seen. Please correct me if I am wrong. Trying to seek more info to piece together this sword that I have but still don’t know what it is. I posted it a ways back but proved to be a tough one to pin down 

[Utopianarian]

Here are a few pics but I can’t  get that bright reflective lightning stripe of kinsuji to reflect or show