Target Hardening methods include tougher perimeter security and motion detection systems, e.g. fences and gates, motion lighting, improved lighting, motion and sound sensors, thermal cameras, low light cameras, as well as trip alarms. There are graffiti paint detectors and graffiti sensors which directly aims to detect the graffiti vandals and afterwards report their actions in order to stop them. In the UK,  the Graffiti E‐nose (a tool designed in Sydney, Australia) detects the paint up to a distance of 45 metres and is able to distinguish between spray paint and solvent.