- 1). Clip the paper to the rack suspended within the fuming cabinet.
- 2). Place the iodine crystals in a glass dish in the fuming cabinet.
- 3). Turn the fuming cabinet on to heat the crystals. The vapors will make the fingerprints visible.
- 4). Turn off the fuming cabinet and remove the paper.
- 5). Spray the fingerprints immediately with a solution of 1 percent starch in water. This renders the prints blue. The tinting will last anywhere from several weeks to a few months.
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