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Following an attempt to clean silver using a hot solution of sodium carbonate and aluminium foil as an anode, I noticed aluminium is aggressively attacked, apparently releasing hydrogen gas, even when not in contact with silver. A reaction I didn’t expect.
A day in the shop heat treating knife blades in my propane forge. I quench in Virgin Olive Oil and finish with water. I find the core of the blade cools quickest doing the two stages. Some of the blades got wavy and are corrected. Every blade heat treated successfully. Although the forge was hotter than it needed to be. I am going to back off the PSI, next time.