Usually prepared by reacting a potassium amalgam with mercury fulminate, it is much less sensitive due to the ionic bond between potassium and carbon, unlike the weaker covalent bond between mercury and carbon.
The sensitivity of a substance can be influenced by the type of bonds present within its chemical structure. In this case, the ionic bond between potassium and carbon is stronger than the covalent bond between mercury and carbon, leading to a less sensitive product.