> Securing & Lifting Shoeprints in organic substances
Methods for shoeprints in blood, grease, urine
> Blood print on plastic bag
A shoeprint in blood was found on a black plastic bag. The print was brushed with Wet Powder White.
Directly after brushing, the surface was rinsed under running water. The result was excellent.
> Blood print on aluminium foil
Shoeprint on wrinkled aluminium foil developed with Wet Powder White. Directly after brushing, the surface was rinsed under running water.
The developed print was photographed on the Photo Table using one white light source with a polarising filter. The camera lens also had a polarising filter.
> Blood print on magazine
Mikrosil Black was used to lift a blood print on magazine paper. After lifting, the print was secured using the Photo Table.
Two light sources with diffusion filters were aimed at an opal board. The diffused light then passed through a semi-transparent mirror.
The coaxial lighting technique makes it easy to see the difference in gloss between the blood and the magazine.
The same lifting method can be used for blood prints on linoleum floors, among other surfaces.
> Blood print on ceramic tile
The pictures on the right show a test of a brand new method.
For these tests some prints were made on clean ceramic tiles using fresh blood.
Wet PowderTM Black was brushed onto the prints. Immediately after, a water spray and an air blower were used at the same time to remove the liquid.
The same method can be applied to other biological substances, such as urine and sour milk.
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