BVDA: Cyanoacrylate fuming: cyanoacrylate staining solutions

Investigation kits Finger- and footprint gelatin lifters Instant lifters Lifting tape and backing cards
	Silicone rubber compounds for fingerprint lifting
Fingerprint powders 1, 2, 3, 4 Fingerprint brushes Amino acid reagents 1, 2, 3, 4 Cyanoacrylate fuming 1, 2 Sudan Black Staining of traces in blood Gentian Violet Sticky-side powder Iodine fuming
	Small particle reagent Flame technique

Fingerprint on aluminum foil, developed with CA and stained with Ardrox

Staining solutions in bottles and spray cans

Fingerprint on white plastic, developed with CA and stained with Basic Yellow 40

Cyanoacrylate fuming 1, 2

Cyanoacrylate staining solutions

After development with cyanoacrylate, fluorescent staining solutions can be applied to improve the contrast of weak fingerprints and those on light-colored surfaces.

Application methods include spraying, dipping, dabbing, and brushing. After rinsing with water to remove excess staining solution, the object is dried and examined with a suitable light source and viewing goggles. The light source excites the fluorescence of the dye from the staining solution.

The viewing goggles should allow only the light of the fluorescence to pass and not the light used for excitation. Depending on the nature of the fingerprinted object (which should not fluoresce in the range where the dye fluoresces) and the availability of a suitable light source and filters, a choice can be made from the following staining solutions.

Ardrox
The fluorescence of Ardrox is induced with long wave UV. A disadvantage of Ardrox is that the fluorescence gradually disappears (over a period of months).

Cat. No. B-89100
Ardrox solution, 500 ml in a spray bottle (isopropanol based)

Basic Yellow 40
Basic Yellow 40 is an excellent dye stain for cyanoacrylate. It fluoresces under blue light (use yellow goggles/filters to view and photograph the fluorescence). The solutions B-85200 and B-85300 can be diluted.

Cat. No. B-85200
Basic Yellow 40, 100 ml solution in a polyethylene bottle
Cat. No. B-85300
Basic Yellow 40, 500 ml solution (2 g/liter in ethanol), in a spray bottle.
Cat. No. B-85250
Basic Yellow 40, 25 grams in a brown glass bottle

Fingerprint on white plastic, developed with CA and stained with Safranine O (top) and Basic Red 28 (bottom)

Above: fingerprint developed with cyanoacrylate, cut in half and stained with Safranine O (top) and Basic Red 28 (bottom)

Below: fingerprint developed with cyanoacrylate, cut in half and stained with Rhodamine 6G (left side) and Basic Red 28 (right side)

Fingerprint on white plastic, developed with CA and stained with Rhodamine 6G (left) and Basic Red 28 (right)

Safranine O
Safranine O is a dye stain for cyanoacrylate that fluoresces under green light (use red goggles/filters to view and photograph the fluorescence). The solutions B-84100/84200 are concentrated solutions that need to be diluted strongly (with ethanol) to prepare working solutions. The fluorescence is less strong than with Basic Yellow 40.

Cat. No. B-84100
Safranine O, 100 ml solution in a polyethylene bottle
Cat. No. B-84200
Safranine O, 500 ml solution (4 g/liter in ethanol), in a spray bottle.

Rhodamine 6G
Rhodamine 6G is an exceptionally strong fluorescing stain for cyanoacrylate. Like Safranine O, it fluoresces with green light. The solution B-854500 is petroleum ether-based (so inks on polyethylene bags will not run) and need not be rinsed with water after application.

Cat. No. B-84500
Rhodamine 6G staining solution, petroleum ether-based, 1 liter in a can

Basic Red 28
Basic Red 28 is a dye that fluoresces under green light. The background staining is somewhat stronger than that of Basic Yellow 40.

Cat. No. B-85350
Basic Red 28, 500 ml solution (2 g/liter in ethanol) in a spray bottle
Cat. No. B-85360
Basic Red 28, 10 grams in a brown glass bottle

Fingerprint on beer can, developed with CA and stained with Sudan Black

Sudan Black
Sudan Black is a non-fluorescing dye in an ethanol/water mixture that can also be used for staining of cyanoacrylate (for example, when the surface with the prints is fluorescent, or has become fluorescent after earlier application of a fluorescent dye stain). The cyanoacrylate is colored blue to black, depending on the degree of absorption.

Cat. No. B-87000
Sudan Black staining solution, 500 ml in a stoppered polyethylene wash bottle

Page 1: Cyanoacrylate, hot plate, aluminum dishes