You've been lucky. Salt does absolutely nothing to set dyes. It is the washing that rids your reds of loose dyes, not the salt.
The very best information on the issue of bleeding fabrics I have
ever seen is found here.
http://askville.amazon.com/stop-towe...uestId=9274753
It covers Synthrapol, Retayne, dye magnets (e.g., Color Catchers), salt, vinegar, and plain water. Bookmark it!
