Ninhydrin Developer

Ninhyrin is a chemical reagent used to develop latent fingerprints on porous materials by reacting with amino acids in perspiration.

Development with Ninhydrin

It is applied by dipping, brushing or spraying the developer onto the desired surface. Development of the fingerprint is catalyzed by the addition of heat and atmospheric water through the use of a humidity chamber to obtain a Ruhemann's Purple dye complex (purple impression of the fingerprint).

Superglue Fuming (Cyanoacrylate)

Superglue fuming has gained wide popularity for developing latent prints on non-porous surfaces such as metals, electrical tape, leather and plastic bags.

Hand held superglue fuming

Developement of the fingerprint occurs when the fumes, created from reacting cyanoacrylate ester with sodium hydroxide, adhere to the latent print, usually producing a white-appearing latent print.
Through the use of a small handheld wand, cyanoacrylate fuming is now easily done at a crime scene or in a laboratory setting.

Video showing both Ninhydrin Development and Superglue fuming.