Rifling stands for the spiral grooves in the gun put by the manufacturer. And the two types of markings are the grooves land on the bullet.It is the process of figuring out the distance between the gun and its target. And it is done by looking at the patterns of the shot and the gun remainings.
Lara used ninhydrin. Ninhydrin is generally applied with a spray bottle, and will work with the amino acids within the evidence to produce a purple-effect. This is also known as Ruhemann’s Purple.
