Bloodstain Patterns by Alyssa Coston

Low Velocity

alyssacoston — 2022-01-12 14:00:07 UTC

Most low velocity impact blood spatters have a diameter of 4 mm or more. The drops fell at a speed of normal gravity.

Medium Velocity

alyssacoston — 2022-01-12 14:03:21 UTC

Most medium velocity impact blood spatters have a diameter of 2-4 mm. The drops fell with more energy than gravity.

High Velocity

alyssacoston — 2022-01-12 14:07:19 UTC

Most high velocity impact blood spatters have a diameter of less than 2 mm. This usually occurs from gunshots or explosions.

Angle of Impact

alyssacoston — 2022-01-12 14:10:37 UTC

Low velocity usually looks like the 90 degree angle of impact. Medium and high velocity looks like the 10-40 degree angles. The smaller the angle, the longer the stain is and has a longer tail. The tail shows the direction that the blood is traveling. The formula for angle of impact is SIN < = width/length.