The woman was a photgrapher- she shoots her husband on a camera, as in taking a picture of him, then holds the picture underwater to develop it (like darkroom photography) and then hangs the picture of the husband out to dry. Her actual husband is still alive, that’s how they enjoy a dinner together. Hope this helps!
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.
