The fine horizontal scratches etched onto a bullet after it has been fired are called Striations.
<h3>What is Striations?</h3>
Striations are the minute differences in the curve of the bullet's surface. The bullet and the gun barrel are the harder and softer materials, respectively, in firearms evidence.
The striations left on the fired bullet are used as a comparison by firearm examiners.
When a gun is discharged, the bullet blasts down the barrel where it strikes ridges and grooves, spinning and improving shot accuracy.
These ridges cause striations in the bullet's soft metal by digging into it.
An examiner analyses these distinctive markings to verify whether a given bullet was shot from a specific firearm.
A barrel will produce individual markings in addition to a bullet's land and groove impressions as the projectile passes through.
