Chemical Development Technique

What are the six Chemical Development Techniques?

Ninhydrin, Cyanoacrylate Vapor Fuming, Silver Nitrate, Iodine Fuming, Diazafluorenone (DFO) and Vacuum Metal Deposition

What material is Ninhydrin used on?

Paper

What color does the fingerprint turn when Ninhydrin is used?

Purplish-blue

What is the process of Ninhydrin?

Object is dipped or sprayed in ninhydrin and wait 24 hours

What does ninhydrin react with in fingerprints?

Amino acids found in sweat

What material is Cyanoacrylate Vapor Fuming used on?

Household;plastic, metal, glass, skin

What color does the fingerprint turn when Cyanoacrylate Vapor Fuming is used?

White

What is the process of Cyanoacrylate Vapor Fuming?

The chemical is heated vapor tent or fuming wand is used

What does Cyanoacrylate Vapor Fuming react with in fingerprints?

amino acids, proteins and fatty acids

What material is Silver Nitrate used on?

wood and styrofoam

What color does the fingerprint turn when Silver Nitrate is used?

black or reddish brown under uv light

What is the process of Silver Nitrate?

Object dipped or sprayed in chemical

What does Silver Nitrate react with in fingerprints?

chloride from skin secretion

What material is Iodine Fuming used on?

paper and cardboard

What color does the fingerprint turn when Iodine Fuming is used?

brownish

What is the process of Iodine Fuming?

Vapor tent and heat solid iodine crystals

What does Iodine Fuming react with in fingerprints?

carbohydrates

What material is Diazafluorenone (DFO) used on?

paper

What color does the fingerprint turn when Diazafluorenone (DFO) is used?

blue-green

What is the process of Diazafluorenone (DFO)?

Paper is dipped into DFO for 10 seconds

What does Diazafluorenone (DFO) react with in fingerprints?

amino acids

What material is Vacuum Metal Deposition used on?

gold and zinc

What color does the fingerprint turn when Vacuum Metal Deposition is used?

gold

What is the process of Vacuum Metal Deposition?

Zinc condenses on the gold coating

What does Vacuum Metal Deposition react with in fingerprints?

non-metal surfaces