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My quenching container. See here for how to quench steel safely.

In order to heat-treat your knife you’ll need a safe, metal container for quenching. It doesn’t need to be huge unless your blades are huge. The rule of thumb is to use one gallon of quenching liquid per pound of steel you plan to quench. A metal paint can, a small pale, or even an ammunition box will work great for this; just be sure that whatever you use is watertight. My favorite quenching medium is canola oil and that’s what I recommend to any beginner. You can pick up a small metal container and a gallon of canola oil for around $8.

Canola oil.