§Latent fingerprints are
those that are not visible to the naked
eye. These prints consist of the
natural secretions of human
skin and require development for them
to become visible.
§Most secretions come
from three glands:
§Eccrine—largely water with both inorganic (ammonia, chlorides, metal ions, phosphates) and organic compounds (amino acids, lactic acids, urea, sugars). Most important for fingerprints.
§Apocrine—secrete pheromones and other organic materials.
§Sebaceous—secrete fatty or greasy substances.
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