This is really temper or fire bluing as all the nitre salts do is heat the metal in a molten salt solution giving a similar effect. Nitre salts make it easier to do larger parts more easily, but I agree for small parts like screws it makes sense to do it with a torch.
This is heat anodizing. This is best applied for small parts or pieces that might undergo a great deal of heat like suppressors and muzzle brakes. For best results, high polish the surface of the object you want to color. This can allow for a wide spectrum of colors to be permanently applied to the metal. Always douse in vegetable oil immediately when you achieve your desired result in order to set the temper of the object.
I can only find a stainless hammer for my Ruger project as they no longer make blued hammers. Could i use this process to get the stainless hammer blued?
Yes but move the heat around a lot, dont keep it focused in one place, and let the object heat slowly for blue or quickly to move through purple, yellow, red and black. If you want a rainbow effect you can move your torch around the object at a higher heat but keep moving like youre painting it. Douse it in vegetable oil to set the temper immediately.
