Colect finger prints on your spy mission. That second picture the finger print but I have a bad camera so I'll just tell you that you can see the actual lines on the finger it's so cool.
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Step 1: Get
Get talcum powder or cornstarch for dark surfaces and coca powder for light surfaces. Also get a paint bursh for dusting.
Step 2: Dust
Sprinkle the powder over a place where the prints are. Take the paint brush and dust it leveing the print exposed.
Step 3: Colect
Press clear scotch tape over the print and gently lift. Press it onto a piece of paper (black or white depending on the color of the powder you used) and examine with a magnifying glass.