Bluing Gun Parts
This is the frame I made (on casters) for my bluing tanks. It
hooked up to my gas hot water heater with a quick-connect fitting, and when not in use, I just wheeled it under a large wall-mounted cabinet.
I soon found that there's a lot more to bluing than most people think. If you've ever tried your hand at bluing, you know what I mean. The first thing
I had to learn was patience in getting the ideal temperature for the bluing solution. The only way the solution gets hot enough is to keep adding more salt.
If the bluing solution doesn't get hot enough, it will not leave a deep dark finish. If the temperature gets too hot (with some types of steel),
your parts might come out purple and that looks really weird.