this post was submitted on 25 Jun 2024
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This is accurate enough for tempering of most cutting tools, but technically, the oxide layer will continue to grow if you hold a lower temperature for a longer than normal time, and might not fully develop if you reach a higher temperature for a shorter than normal period of time.
This property useful if you are trying to develop a specific color rather than achieve a specific metallurgy. You can heat to a lower temperature for a longer time to develop a deeper, more consistent color.
In my experience, it's easier to develop colors with an oven or propane torch rather than a forge or acetylene.
Yeah I referenced Clickspring, when oxidizing a part for decorative purposes he would put the part in a brass tray full of brass shavings apparently to function as a thermal mass so that the color comes out evenly.