One thing not mentioned is what you're looking to avoid when you're conducting the UET.<p>When testing skin contact beware of:<p>* Rash<p>* Hypersensitivity (to touch or light)<p>When testing by contact with the lips and chewing beware of:<p>* Numbness or pain<p>* Spicy flavour, heat or burning sensation<p>* Any hint of a taste of almonds (as mentioned: Cyanide. Not a good idea)<p>This is by no means complete, the 'SAS Survival Guide' has some good info on this topic, though other parts of that book should be taken with a grain of salt...