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

 
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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


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