Indirect percussion is a technique which involves striking a punch-like object with a hammer or percussor. The tip of the punch is rested on the platform of the core at the point intended to receive the blow. It is important to keep the core immobile during the striking process. When using this technique it is also advisable to prepare the core platform to prevent the punch from slipping.

In indirect percussion a punch of antler or wood or other hard material is placed on the platform and struck with a hammer, instead of striking the stone directly with the hammer. This allows the force to be directed very precisely, an important factor in making blades, which require a carefully prepared core with an even platform and regular ridges for the blades to follow." Whittaker 1994., 33
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