Here is a url for general information about cold blueing: http://www.gunsandammomag.com/techside/blue_0515/ Some additional resources: http://www.finishing.com/0800-0999/982.shtml http://www.finishing.com/78/92.shtml Haven't tried any of these personally, so it is user beware! I do agree with the guy who says "Be careful. This stuff is poison." Charles MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.