Hi Salopian

There is something a lot better than a book tell your friend. Just enter "Rust bluing" in You Tube you get a practical demonstration on the how to do it. But you and I know it is the different Formulas for the solutions that makes the diference. May be your friend should buy the re print copy of Angier's from Amazon it is extreemly cheap for what infomation you get from it.

The only lessons in my life I truly did learn from where the ones I paid for!