At present the evidence in forensic science. To play an important role in the process. Because evidence at a crime scene can be aware of wrongdoing. Do wrong in what ways.And who is the culprit, as well as proof of the innocence of the accused one of witness evidence is important in forensic science Prints, because the pattern "(permanence) and fingerprint of the individual are unique (uniqueness) characteristics of the prints in the place of birth เหตุมี 2 types. Prints can be seen with the naked eye (visible fingerprint) and established Lai Lai unseen fingers.Also known as a latent fingerprints (latent fingerprint) at the scene to find Roy. Latent fingerprints. Therefore, to choose the methods to keep the latent fingerprints to suit the object. Each witness types.The surface of the object involved in choosing methods collect prints the latent object surface is porous adsorbent, such as paper, wood, not painted. The chemical reaction with the substance composition of prints.Smooth surface does not absorb objects such as glass using a brush with dust to a latent fingerprint appearing and peel away with transparent tape. But there are some limitations in the surface.Due to rough surfaces. A rough groove which tape cannot sink by groove rough The stripping away the latent fingerprints from the ground. There's a space curved surface or bubbles occur.The strokes of the periodic discrete, which is usually a latent fingerprints. Peel was a problem that the clarity and the continuation of the line Make difficult identification comparison.Such as rough surfaces, curved surfaces, using the human skin chemicals semi liquid or liquid applied on the latent fingerprints appear. How like the handsome traces when chemicals.Chemicals used as adhesive, cement or silicone (Frost 2005) is a private company to produce Tex-Lift silicone adhesive and clear (Transparent Silicone). The name, claiming that AccuTrans.And can be used to verify comparison without the transposed to the latent fingerprints collected. Usually nonporous latent prints on rough surface and curve surface pile prove main center baseTherefore, it is interesting. Study of how to keep the latent fingerprints with a new technique that can be used as well with rough surface and the surface. Curve compared with the present method.Uneven surface and curve surface And help the work of identification comparison easier. Since strokes clear complete