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For the lifting of footwear impressions (made with dust or dirt) no material is better suited than black gelatin lifters, due to its low tack. Whereas synthetic materials with a high tack tend to lock in air bubbles upon application, a black gelatin lifter easily lifts a complete print without disturbing the surface on which the print is found.
Furthermore, the high-gloss black gelatin layer absorbs light so strongly that it can be over-exposed many times. When a black object, next to the lifter, shows up white on a photograph, the lifter is still dark gray. Its light absorption and high gloss enables photographing of even very faint impressions.
The shoeprint sizes are either 5.2" (13 cm) or 7.2" (18 cm) wide and 14.4" (36 cm) long. Also available are sheets of 14.2 x 17.7 inch (36 x 45 cm).
White gelatin lifters are not intended for the lifting of footwear impressions in dust (black lifters give a much better contrast) but are well suited for the lifting of prints in blood (finger- or shoeprints) that have been stained with protein dyes, such as Amido Black or Hungarian Red.
All gelatin lifters are packaged in sealed envelopes made of a laminate material. This material protects the gelatin layer against moisture. Thus the tack is retained, even after prolonged storage.
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