What method has been suggested for visualizing latent fingerprints on human skin?

The method of visualizing latent fingerprints on human skin that incorporates both Magnetic Powder and Iodine-silver plate transfer is effective due to the unique characteristics of each technique.

Magnetic powder is particularly useful for developing fingerprints on various non-porous surfaces, and it can also be carefully applied to skin, highlighted by the magnetic properties that allows it to adhere to the oils and residues left by fingerprints. The technique employs a magnetic applicator to avoid excessive friction and potential damage to the skin, thus ensuring a non-invasive application.

Iodine-silver plate transfer, on the other hand, is a method that uses iodine to visualize fingerprints as it can react with organic materials in the residues of fingerprints. When the iodine sublimates, it forms a dark brown stain that can be captured on a silver plate, which can also be adapted for use on skin under controlled conditions.

Combining these two methods allows for a greater likelihood of successfully visualizing latent prints on the complex surface of human skin, which may vary in texture and oiliness among individuals. The use of both Magnetic Powder and Iodine-silver plate transfer highlights different aspects of fingerprint development, increasing the overall efficacy of the visualization process.