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 casting compound is mixed with hardener and diluant (if needed) 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.
Silmark Black is used for lifting of fingerprints developed with fingerprint powders. Light coloured fingerprint powder, for example the regular or magnetic silver or white coloured ones, contrasts well against the black background that this silicon material provides.
SILMARK, black, 150 g in tube, with 20 g paste hardener
Silmark white is used for lifting fingerprints which are developed with dark fingerprint powders like Swedish Black and Magnetic Black. The white colour of the silicon material offer a contrasting background for dark coloured fingerprint powders.
Silmark is also available in grey and brown for the casting of toolmarks.