Question

Lara was examining a crime scene she found a piece of cloth at the scene which she thought might have some finger prints she used a detection technique that made a purple print visible what technique did Lara use​

Answer 1

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.