足迹FOOTPRINT足迹足迹.ppt

足迹FOOTPRINT
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2D- once the print is photographed it can be lifted with a gel lifter, shoe impression li足迹FOOTPRINT
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2D- once the print is photographed it can be lifted with a gel lifter, shoe impression lifters or fingerprint tape. When using fingerprint tape the impression will have to be lifted in the same manner as a multi finger lift.
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Enhancing 2-D prints The 2D print can sometimes be “developed” in much the same way as a fingerprint by using black powder. The print can then be lifted and placed on acetate or white paper.
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Electrostatic Dust Print Lifter about 20 years ago a recovery method was developed for collecting dust prints. This method uses an electrostatic charged piece of Mylar film to lift the prints.
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The electrostatic dust lifter will work on virtually any surface.The print quality will vary because it is dependant upon the surface where the print is located.
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If you have a stun gun you already have the major component of a dust print lifter.All you need is a piece of Mylar film to lift dust prints.
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Methods of Recording Shoe Sole Impressions.
Photography
Documentation/sketching
Lifting
Casting
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Sketchingdraw a diagram or sketch of the impression noting anything unique about.
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Equipment needed:1 gallon zip-loc bag or a plastic bucket2 to 3 pounds of dental stone or plaster of Paris6 to 9 ounces of water.Mix to a “pancake” dough consistency.
Casting
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Before pouring the mixture the impression needs to be prepared:
If the impression is in a “sugar” sand or powdery medium the soil or medium will have to be “fixed”.
Use a pump type bottle of hair spray and lightly coat the impression to fix it.
Also remove any excess debris (leaves,twigs etc.).
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“Fixing the Impression”
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Beginning on one side of the impression pour the casting material and let it flow across the impression.
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After the castin