In this series of articles, the Science of Security Fog, we will address the many technical questions people ask when they are thinking about investing in security fog to protect their home or business. We've spent decades studying the science behind this security technology, and we're eager to share our knowledge and expertise with you so that you can have an even better understanding of how our security fog generators work - and why they're so effective at preventing break-ins and crime.
In our first article, we're answering the question: 'Why is security fog white?'
If you opened up a container of the fluid that goes into our Smoke Screen generators, you would find that it is clear - so why is the fog that the machine produces white?
The answer lies first in the heater block, the part of the generator that turns the fluid into fog. The fluid is passed through the heater block under pressure, vaporising it. When released from the Smoke Screen at high velocity, the vapour condenses in the cooler air, creating a fog made up of microscopic droplets. The droplets are suspended in the air, forming what appears to be a dense barrier. This barrier looks white because of the way light interacts with the droplets.