Nitre Bluing Salts. At the lower temp you will get bronze and gold colors. You see the transition from pink powder to a yellow foamy liquid. Also the it will not blue in ordinary salts.
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Bluing salts typically function in the high 200 degree range. Potassium nitrate is potassium nitrate, regardless of i highly recommend nitre bluing for small parts. How does this relate to the blue finish one gets by simply heating steel in gunsmithing terms that'd be salt bluing, which was always rather rare, and more. I got my low temperature salt pot finished and the temperature controller tuned. It's easy, and gives beautiful results. Niter bluing is mostly a heating technique to achieve different color to the steel. Nitre bluing is more closely related to heat treating or heat bluing. Next you must cool off the steel fast enough to create martensite instead of pearlite which generally involves a quench of some type.
