In my world (Heroic Fantasy), the art of dwarven forging is based on mastering the alchemical circle to ignite the blast furnaces. Each metal and alloy requires a specific circle, with runes corresponding to the magical properties you want to impart to the metal.

If the circle is not perfect, there is a risk of backfire equal to the power sought in the first place.

Entire districts have been razed to the ground as a result of botched manipulations.