Pre-Screening for Explosives Residues
7
testing, only three sequences were performed during this phase. The eight
different types of paper were used, and the same technique was conducted as
before.
The third phase was designed to identify three distinct color intensities that
could be quantitatively matched to "order-of-magnitude" dilutions of tenfold,
hundredfold, and thousandfold. Standards of 20, 30, 40, 50, 100, 250, 500, 750,
and 1000 ppm were made to cover the realistic concentrations found at training
ranges and also the dynamic range of the color intensities. Having eliminated
most of the differing types of paper (see results), two sequences were tested using
only the Whatman's #1 filter paper. The same technique was conducted as
before.
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