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Certain surfaces have such a texture that even with gelatin lifters, it is hard to lift powdered fingerprints in their entirety. Examples are: Hammerite painted coin boxes and polystyrene packaging material. In these cases, white or black silicone rubber casting compound can be used. The low viscosity casting compound is mixed with hardener and poured over the print developed with fingerprint powder. After the silicone rubber has cured, the fingerprint is lifted.
Depending on the color of the fingerprint powder that was used, white or black silicone rubber is used for contrast. The white rubber has been formulated in such a way that backlighting of the cast is still possible.
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