Dear All, I am not sure whether it is widely used or not however heat indicator labels can be used to track the heat exposures over a vaccine. A label with different colors and different chemicals on it can show the heat exposure. I tried to demonstrate it in the drawing below. http://imageshack.com/a/img843/6878/t5b8.jpg --- With my Best Wishes M.Fatih BARUT D.V.M PhD Virological Diagnosis Lab. Etlik Central Veterinary Control and Research Institute Kecioren / ANKARA /TURKEY 06020 ######################################################################## To unsubscribe from the FAO-AnimalHealth-L list, click the following link: https://listserv.fao.org/cgi-bin/wa?SUBED1=FAO-AnimalHealth-L&A=1