MikeLigalig.com

Forensic chemists at the Hebrew University of Jerusalem have developed a color-changing spray that can identify people suspected of making or planting bombs.

The chemical turns from yellow to bright red when it comes into contact with urea nitrate, an explosive residue that may be left behind on the hands of someone who has handled an improvised device.

source: slashdot.com

Where do you think they would use it? wa rapod kaha nay side effects? like me, if they apply it in all airport terminals (i hope not) am allergic to almost all fumes and chemicals, aerosols and everything...