Crime Scene Investigation

Test out your Chemistry (and detective) skills with this conundrum from St John’s Chemistry Tutor Professor Richard Compton and his research group.

Q: In some movies, the crime scene investigators spray chemicals to find traces of blood even if most of them have been cleaned or removed. Fluorescent blue light is normally shown in the place with blood. What is the spray and how does it work?

Click here for the answer.

Teachers we want to hear from you too if you want to get involved and set some questions of your own – email