Which type of prints requires processing to be seen?

• A. Latent
• B. Patent
• C. Visible
• D. Plastic

Answer: (A)

The main idea is that fingerprints are categorized by whether they’re visible without help or not. Latent prints are not visible to the naked eye because they’re made of sweat and oils left on a surface. They require processing—like dusting with powder, chemical treatments (such as Ninhydrin or cyanoacrylate fuming), or special lighting—to reveal and preserve them. That’s why this type is described as needing processing to be seen.

By contrast, patent prints are already visible, created by ink, blood, or another substance that leaves a visible mark without any treatment. Visible prints are simply prints you can see without any enhancement. Plastic prints are three-dimensional impressions left in soft materials like modeling clay, soap, or wax; they’re also visible in the material itself and don’t depend on processing to be seen.