Why Blacksmiths Stick Red Hot Metal Into Mud - Video

When steel is heated and then cooled, the cooling rate affects its final properties. Rapid cooling, known as quenching, can increase hardness but may also make the metal more brittle. Slower cooling methods using mud, clay, ash, or other moisture-rich materials help reduce thermal shock and internal stress.

For centuries, blacksmiths have used different cooling techniques to achieve the perfect balance between hardness, flexibility, and durability, depending on the tool they are creating.

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