Mmm786

Hmmm the cosmetics and detergent theory could be quite good as I want them to find the switch or lever by mistake. Which cosmetics would you recommend?

Yeh that's a good idea I was thinking one of the bricks could be made of, or includes, a fluroscent mineral. Although it looks the same as the other bricks to the naked eye, it's a different colour under a UV torch? Is that plausible?

Thanks I want it so that anyone following can't see it with the naked eye that's why I went down the UV light route. Any better suggestions would be appreciated. So far the lever option sounds the easiest.

Thanks guys what kind of things show up under a UV light?

Hi I am stuck writing a novel. The protagonist is stuck outside a building being chased by the bad guys. He already tried to get into the building during the day but there was no way in. There are no doors windows or anything. My idea was he sees a lever or switch using a uv torch he is carrying but is this scientifically possible? Can anyone think of a better solution? The important thing is they are able to get in because it's night if that makes sense. Any help would be much appreciated. Max