here is a hypothetical question

Question

I am an art teacher and craft writer. I need to know if fabric that has been rusted (by choice), or stained from coming in contact with rust, will continue to rust and destroy the fabric. If yes, is it possible to neutralize or seal the rust to stop it from destroying the fabric.

I don't know much about this personally, but for what it is worth, here are two sites that appear to know about the process.

http://www.prairiefibers.com/Rust%20Dyeing%20Q%20A.htm

http://www.ehow.com/how_18793_remove-rust-fabric.html