By adding a drop of liquid containing crystals to surfaces, investigators using a UV light are able to see invisible fingerprints “glow” in about 30 seconds.
The strong luminescent effect creates greater contrast between the latent print and surface enabling higher resolution images to be taken for easier and more precise analyses.
Different colours can be achieved by altering the chemistry of the solution. This photo shows the method on the blades of two knives.
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<table style="border:1px solid;padding:2px; width:310px;" ><tr><td><a href="https://www.scienceimage.csiro.au/image/2522/"><img src="https://www.scienceimage.csiro.au/images/embed/300_0_TE2522.PNG" width="300" alt="Glowing fingerprints to fight crime" style="margin: 0 0 5px 0; border: 0px;"></a><br/><a href="https://www.scienceimage.csiro.au/image/2522/">Glowing fingerprints to fight crime</a><br />by CSIRO</td></tr></table>
Glowing fingerprints to fight crime