Coleman Vacu-Print™ Glue Fuming Unit
with glue under vacuum conditions has proven to be very effective. It
prevents several problems which are present with glue fuming under normal
conditions, such as, using a fish tank or other closed chamber. Processing
large garbage bags in a medium-size fish tank is not effective, since
the glue fumes do not reach all parts of the bag evenly. Some parts of
the bag have heavy white residue and other parts show none at all.
When glue fuming under vacuum, it is nearly impossible to overfume items.
There is no white residue buildup on the evidence or inside the chamber.
The most exciting part of all is that items, such as wadded-up garbage
bags and baggies, do not have to be hung up or spread out. In a fish tank,
evidence which is closer to the glue many be overdone on one side with
virtually no residue on the other. With the vacuum, all sides fume evenly.
Until recently, vacuum systems were very expensive and quite large. Doug
Coleman of the Santa Maria Police Department in California researched
and developed a vacuum system that performs well, yet is reasonable in
cost and fits on a counter top. It is made of high-tensile strength, aircraft
aluminum. This material was chosen over PVC, because PVC may degrade with
time and usage.
The Coleman Vacu-Print™ Long Chamber, shown above, is used for
processing large evidence, such as, rifles and bats, or if larger quantities
of evidence must be developed. It is 48" long and has a 7 3/8" inside
diameter. It comes with a plexiglass stand. The Pump/Motor is 1/3 horsepower
with 3 CFM vacuum. The same pump/motor will operate either chamber. It
is possible to purchase both chambers and only one pump/motor. Store each
piece away in a closet or cupboard until needed.
To use the vacuum system with either the table top or long chamber, place
several items inside. They may touch the sides of the chamber and each
other. Cut a small strip from a Hard Evidence™ pouch and tape it
to the inside of the chamber or put five to ten drops of liquid glue in
a small dish and place it inside the chamber. Evacuate the chamber and
allow the items to fume under vacuum for about twenty minutes. When finished,
the evidence will not have a thick layer of white powder residue, although
the latent prints are "locked on" the item. Allow them to remain in the
air for about ten minutes before processing them with powders or chemicals.
If a forensic light source or ultraviolet lamp is available, it is recommended
that fluorescent dye staining or powders be used to visualize the latent
prints on these pieces of evidence. If the evidence is fairly fresh (within
about a week), use fluorescent powders, such as Redwop™ and Greenwop™
or Blitz-Red™ and Blitz-Green™ magnetic fluorescent powders.
If the evidence is older than a week or so, liquid dye staining is recommended.
Some of the liquid dye stains available are Ardrox, Rhodamine 6G, and
Basic Yellow 40.
Coleman Vacu-Print Table-Top Chamber
Coleman Vacu-Print Long (Rifle) Chamber
Vacuum Pump/Motor, 220 volt for export
Vacuum Pump Oil, 1 Quart