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In the January/February 1995 issue of the Journal of Forensic Identification (vol. 45, no. 1), Williams D. Mazzella and Christopher J. Lennard discuss the uses of Basic Red 28 and how it compares to Rhodamine 6G, Basic Yellow 40 and Styryl 7. They concluded that Basic Red 28 has a Stokes Shift three times that of Rhodamine 6G (90 nm versus 30 nm). It can be used alone to dye stain cyanoacrylate-developed prints or can be mixed with a solution of Basic Yellow 40 to provide a wider range (about 145 nm) of fluorescence. Mix 0.2 grams of Basic Red 28 in a solution of propanol, acetonitrile and petroleum ether. View our Technical Note for more information on this product.
Basic Yellow 40 can be used after glue fuming on surfaces such as cans, leather and plastics. A Forensic Light Source or UV lamp can be used to examine the evidence. Basic Yellow 40 fluoresces well between 365 nm and 485 nm. Mix about 2 grams in a liter of reagent alcohol. Basic Yellow 40 is the ""Y"" in the special solution known as RAY. The other parts are solutions of Rhodamine 6G and Ardrox. View our Technical Note for more specific information on mixing and using this product.
Shelf life of dry powder: indefinite as long as it is dry. Store in a cool, dark place. Shelf life of mixed solution: approximately 6 months. While reports indicate that the solution will still work after 6 months, the results may not be as good as with fresh solution. Store the mixed solution in a dark bottle in a fume hood or flammable liquids cabinet.
With the advent of new, faster, more precise DNA testing, collecting evidence such as blood and body fluids from crime scenes has become even more important than before. This evidence must be collected properly for accurate test results.
If the blood stain is damp, dab one sterile cotton swabs on the stain. If the stain is dry, wet the swab with distilled water and dab on the stain. Wet a second swab with distilled water and swab the background surface near the stain without touching the stain. The second swab is used to determine if any contaminants may be on the background. At the end of the collection process, also wet two swabs with distilled water only. This is a control sample to show that your distilled water did not contain any contaminants.
Once you get them back to your office, you must dry the swabs before packaging. Here is a swab dryer, a case for carrying the swabs from the crime scene and packages of sterile cotton swabs. The Swab Dryer is 8" W x 13.5" L x 8.5" H. The rack inside holds 18 swabs at one time. There are nonskid feet on the bottom for placing the dryer on a counter and two key hole attachments on the back, for mounting. A timer comes with the dryer so you are reminded to take the swabs out. The Rack and Carrying Case is used to transport the swabs from the crime scene to your office in a clean container. See
Tech Notes
Ardrox is a fluorescent liquid dye which works well with lasers, Forensic Light Sources and UV lamps. Ardrox can be used full-strength or can be diluted with ethanol or methanol. Since the solution is about the consistency of syrup, most examiners prefer to dilute it. Ardrox dyes glue-fumed, developed latent prints quite well. While Ardrox-developed prints fluoresce under 365 nm, better results have been reported while examining evidence with 450-480 nm light. View our Technical Note on Ardrox for more specific information.
TapeGlo™ is a safe-to-use liquid for developing latent prints on the sticky side of tape. The resulting latent prints will need to be visualized with a laser or Forensic Light Source and then photographed. The liquid can be sprayed or it can be poured into a tray and the tape dipped into the solution. Rinse off the excess with water. You can photograph the latent prints immediately or you can wait until they dry. There are no hazardous or flammable liquids in this product so you do not have to use this liquid in a fume hood. It is safe to use at crime scenes also. For more information, view our Technical Note.
As with any fluorescent product or powder used to develop latent prints, use a colored filter on your camera to photograph the latent prints (the same colored filter as the colored goggles you wear to see the print). For tips on photography of fluorescent latent prints, please view our Technical Note.
Rhodamine 6G is one of the best laser/Forensic Light Source dyes available on the market for developing latent prints. It is inexpensive, safe-to-use and a little goes a long way. Mix about 0.1 gram in 2-3 liters of solvent. It can be diluted in Methanol or other similar solvent, or in water and be used on metal, glass, leather, plastic, and other objects. Tests should be conducted on different surfaces to determine which solvent mixture will work the best on a particular surface. For more information on mixing and the applications of Rhodamine 6G, please view our Technical Note. Rhodamine 6G is the ""R"" in the special solutions of RAY and RAM. Solutions of Ardrox and Basic Yellow 40 are the other two parts to RAY. Solutions of Ardrox and M.B.D. are the other two parts in RAM.
To develop latent prints with DFO, the process requires that the paper item be
heated (100°C or 212°F) for 10-20 minutes. An oven will produce far superior results to an iron or hair dryer. With an oven, the entire document is heated all at once as opposed to using an iron which only heats small areas at a time. The chamber is factory-set at a maximum temperature of 212°F to provide the correct setting for DFO processing. Paper items can be hung inside the chamber or can be placed on the removable shelves. This chamber can also be used to accelerate the technique of Ninhydrin processing.
Please make note this is the larger of the two models it weighs 75lbs the cost of shipping has been add to the price there will be no additional charges
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