High Velocity Impact Spatter (HVIS)
100 + fps
Here is an example of forward spatter resulting from a .22 cal bullet traveling through a blood soaked sponge at a range of 6 inches (sponge to target surface). Notice the majority of stains are well under 1 mm fitting the HVIS criteria and mist like appearance.
Some of the larger stains you see are bits of sponge which have been deposited.
The picture above illustrates that there is a greater amount of forward spatter as opposed to back spatter and that this spatter will travel in a cone (conical) shape. High velocity spatter (1mm and less) has been stated to travel up to approximately 4 feet due to gravity, air resistance and specific volume. This explains why it would be possible to view a crime scene associated with a high velocity event and not notice any 1mm and less in size stains, but have larger ones present. This is because the larger stains will travel further than smaller ones due to their volume and the effects of gravity and air resistance. Keep in mind that clothing, hair and bone can inhibit the spatter pattern thus not getting a cone shaped pattern.
Garden hose demonstrating the cone shape.
Notice the difference in the amount of spatter created between the two pictures below.
The picture above is forward spatter from a .22 cal bullet entering a blood soaked sponge. The range from the sponge to target surface (cardboard) was approx. 12".
Here is the back spatter at the same range/distance (12").