Thanks Magnus919,

I was aware of iron gall inks, my dad used to work in the Legal trade. I have been warned not to use such inks in a fountain pen. However, I wasn't aware that school ink was an example. Good to know.

Your blog is looking interesting. Some nice looking pen photographs.

Since the coment system here doesn't display the website (and I'm an admin) I'm showing it here:

https://cheapgeezer.wordpress.com/

Dave