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Processing Methods

AMIDO BLACK

Amido Black is a dye that stains the protein in blood creating a blue-black reaction. This process is used only for blood-contaminated prints to enhance them. Use on non-porous and some porous surfaces. Photograph the prints to document.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations. Blood samples must be taken before using Amido Black.

DFO

DFO reacts with amino acids in fingerprints causing them to fluoresce. Use on porous surfaces such as paper, cardboard, raw wood and sheet rock paper. Not suitable for items that have been wet. Must be used before NINHYDRIN, SILVER NITRATE and PHYSICAL DEVELOPER. The use of an alternate light source is required since this is a fluorescing process. Photograph prints to document.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

FLUORESCENT DYES

Fluorescent Dyes such as ARDROX, BASIC YELLOW and RHODAMINE 6G are used to enhance latent prints developed by SUPER GLUE. The use of an alternate light source is required since this is a fluorescing process. Photograph prints to document.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

FLOURESCENT POWDERS

Fluorescent powders adhere to both water and fatty deposits. Use on fairly smooth, non-porous dry surfaces. Apply with a feather brush for best results. FLUORESCENT POWDER requires an alternate light source or UV light to view prints. Photograph prints to document before lifting.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

GENTIAN VIOLET

Gentian Violet stains the fatty constituents of sebaceous sweat creating a purple print. Use on the adhesive side of tapes, labels and some surfaces contaminated with oils and grease. Photograph the prints to document.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

IODINE

Iodine reacts with the oils and fatty deposits to produce a brown print. Use on porous surfaces such as a piece of paper. Use on prints less than two days old. Prints must be photographed immediately as they fade rapidly. Use before DFO, NINHYDRIN, SILVER NITRATE and PHYSICAL DEVELOPER.

Can interfere with the examination of body fluids.

NINHYDRIN

Ninhydrin reacts with the amino acids in fingerprints producing a purple reaction. Use on porous surfaces such as paper, cardboard and raw wood. Not suitable for items that have been wet. Use before, SILVER NITRATE and PHYSICAL DEVELOPER. Photograph prints to document.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

PHYSICAL DEVELOPER

Physical Developer reacts with the components of sebaceous sweat to for a gray silver deposit. Use on paper, cardboard and light raw-wood. A very effective method for processing paper that has been wet. Photograph prints to document.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

POWDERS

Powders adhere to both water and fatty deposits. Use on fairly smooth, non-porous dry surfaces. Select a POWDER to contrast with the background. Apply with a fiber brush or feather duster. Use before IODINE, NINHYDRIN and after SUPER GLUE. Photograph prints to document before lifting.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

SILVER NITRATE

Silver Nitrate reacts with the chlorides present in fingerprints to produce silver chloride, a material which turns gray when exposed to light. Use on paper, cardboard and light colored raw-wood. Not suitable for items that have been wet. Photograph developed prints immediately because the reaction will eventually and permanently fill the background. Use before PHYSICAL DEVELOPER.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

SMALL PARTICLE REAGENT

Small Particle Reagent adheres to the fatty constituents of latent fingerprints to form a gray deposit. Two methods of use are the dish method and the spray method. Prints that are developed are very fragile. Photograph print to document then lift print. Use on smooth non-porous surfaces, including wet surfaces such as plastic bags, waxed and plastic coated paper, glass, and gloss painted articles.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations.

SUPER GLUE

Super Glue vapors react (polymerize) with waters and other possible fingerprint constituents to produce a white deposit on the fingerprint. Use on most non-porous surfaces such as plastic bags, glass plastic, Styrofoam, rubber, vinyl, metal, wax surfaces and some porous surfaces. Developed prints can be processed with POWDERS and lifted or treated with FLUORESCENT DYES. Photograph the prints to document.

Can interfere with examinations for handwriting, body fluids, trace evidence and most other forensic examinations including firearms.



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