Rust Bluing
There is a book, Firearm Blueing and Browning by R. H. Angier, that is (or was) available from Amazon.com that covers rust blueing in detail, but the general process is as decribed in the General Information/Frequently Asked Questions, with an additional step: the rusted parts are boiled (usually in plain distilled water), or subjected to live steam (the steam cabinet described is not at boiling temperature, but is warm and damp to promote rust formation) before they are carded. This converts the soft red rust into the harder black oxide.
All of the processes described by Angier pretty much follow the above pattern, but the formulas for the blueing chemicals vary greatly.
Bob
|