Which item is suitable for latent print development by lab methods such as glue and chemicals?

• A. Glass window
• B. Wooden door
• C. Paper documents
• D. Plastic spoon

Answer: (C)

Latent prints respond best to chemical development on porous materials because reagents can penetrate the fibers and react with components of the fingerprint residue to produce a visible image. Paper documents are porous, so chemicals like ninhydrin or related reagents can diffuse into the paper and create a clear print, often turning it purple or similar colors. This makes paper documents the most suitable for lab methods that use chemicals (and can be paired with other methods, like glue fuming, on appropriate surfaces). In contrast, glass or plastic are non-porous and rely more on fuming methods, while wood can be inconsistent due to its grain and finishes, making reliable chemical development harder. So, paper documents are the best fit for these lab latent print development techniques.