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Glenn Dee · December 27, 2009, 06:38 PM

Hey Madison

I'm not sure how the FBI does it ut I have seen it done elsewhere.
They use etching acid. A very diluted sulphuric, or heat and photography.

December 27, 2009, 06:38 PM	#25
Glenn Dee Senior Member Join Date: September 9, 2009 Location: South Florida Posts: 1,560	Hey Madison I'm not sure how the FBI does it ut I have seen it done elsewhere. They use etching acid. A very diluted sulphuric, or heat and photography.