Measuring trace amounts of TNT on a fingerprint
ASU scientists have hit on a new method to significantly improve the detection of trace chemicals important in such areas as national security, human health and the environment.
For example, the method can be used to measure trace amounts of TNT on a fingerprint. The ridges of a single fingerprint can be seen against an orange background. As a potential is applied, trace amounts of TNT come into view, ranging in color from bright yellow dots to black, depending on the concentration.