Hot Bluing Video

Before ANY ONE ELSE!!!!!!!!!! decides to tell me what I'm doing wrong with maintaining temperature control - READ THIS! Black Oxide Temperature - Since water boils at 212F at sea level and the operating temperature of Oxiblak is 290-295F, black oxide salts must be added to the bath to raise its boiling temperature. To understand how the amount of salts in a solution affects the boiling point, you must understand that adding salts to the solution makes it stronger and denser. Denser liquids have higher boiling points. Adding water to the solution lowers the density and, therefore, lowers the solution boiling point. When the boiling point is correct, the solution concentration is correct. Oxiblak has a recommended operating temperature of 290-295F. The black oxide operating temperature is not controlled by the heat source, it is controlled by the combination of the heat source and the concentration of chemicals in the solution. Never try to obtain the proper operating temperature of a black oxide bath by adjusting the tank's heating system up or down. The heat source should be set for the day at a gentle rolling boil - then you can maintain the proper operating temperature with the additions of salts or water. For example, if your solution is boiling at 275F, you must add black oxide salts to your tank which will result in a denser solution and raise the boiling point. If your solution is boiling at 290F, you must add room temperature water to the tank to create a thinner solution which will lower the boiling point. Boiling Point - The boiling point of a black oxide bath is indicated by a slight eruption in one corner or along the sidewall of the tank. This slight eruption along with the proper operating temperature indicates that blackening is occurring. A black oxide tank can be heated to the proper operating temperature but without this boiling action - blackening will not occur