Here is a little contraption I made for effortless blueing of screws and hands. A good friend of mine made one and I knew I had to copy him. It uses a temp control that can be set to hold a certain temp closely on a brass block. A ten buck thermocouple, 200W heater, brass block, $25 dollar PID controller, 6x6 electrical box, relay and some wiring. Dark blue (570F), plum (540F) or gold (450F), easy as can be, just set the temp. I drilled a number of different sized holes for screws and milled a larger hole for hand hubs so they lay flat. No more watches a blueing pan intently, or having hands overblue at the tips....
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