Final answer:
Cyanoacrylate is the key chemical in Super Glue Fuming, which polymerizes to visualize fingerprints for crime investigation purposes.
Step-by-step explanation:
The important chemical used in superglue fuming to visualize fingerprints is called cyanoacrylate. During the fuming process, cyanoacrylate polymerizes in the presence of moisture, which is present in fingerprint residues. This polymerization causes the cyanoacrylate to adhere to the fingerprint, hardening into a white polymer that gives contrast to the fingerprint against the surface it is on, effectively making the fingerprint visible.