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Chapter 95: Advanced Skills
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... formation.
Besides age, a fingerprint can also determine if someone smokes, has taken medication or consumed alcohol recently, and even what cosmetics they use.
This is because a fingerprint is composed of substances formed by sweat and oils secreted from the sweat and sebaceous glands on the fingers.
These components are 98% water, plus various trace elements such as amino acids, iron, magnesium, zinc, and urea.
It is precisely these minute components that can ex ...
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