Intro to fingerprints
All fingers, toes, feet, and palms are covered in small ridges. These are raised portions of the skin, arranged in connected units called dermal, or friction, ridges. They help us with our grip objects that we touch. When these ridges press against things, they leave a mark, an impression which is known as a fingerprint.
The imprint of a fingerprint consists of natural secretions of the sweat glands that are presen in the friction ridge of the skin. These secretions are a combination of mainly water, oils, and salts. Dirt from everyday activities is also mixed into these secretions. Anytime you touch something, you leave behind traces of these substances in the unique pattern of your dermal ridges.
The imprint of a fingerprint consists of natural secretions of the sweat glands that are presen in the friction ridge of the skin. These secretions are a combination of mainly water, oils, and salts. Dirt from everyday activities is also mixed into these secretions. Anytime you touch something, you leave behind traces of these substances in the unique pattern of your dermal ridges.