The Double Gun Journal has a number of excelllent articles authored by Oscar Gaddy, considered by many as the foremost authority on restoration, whether rust bluing, case coloring, or damascas restoration. They will sell you reprints for a reasonable cost, and the data is priceless. He includes recepies for rusting solutions as well. I use his formulations in my restorations, and my clients have been very happy with the results. raltenhof