Final answer:
Xerography is the chemical technique used to develop latent prints on nonporous surfaces such as metal and plastic.
Step-by-step explanation:
The chemical technique used to develop latent prints on nonporous surfaces such as metal and plastic is called xerography. Xerography is an electrostatic process commonly used in copy machines. It involves exposing the surface to be developed to an image and using a combination of positive and negative charges to transfer the image onto the surface.
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