Article from the American Journal of Pathology Compares Performance
This article entitled ‘Temperature-Sensitive Labels for Containers of RBCs’, is a study of the ‘suitability of temperature-sensitive labels fixed to the exterior surface of blood containers for monitoring the temperature of blood components outside of the temperature-monitored refrigeration’.
The authors evaluated Safe-T-Vue, Hemo Temp II, and Spot Check. Figure II is an insightful display of the variation of temperatures across blood bags as they warm, using 5 different starting temperatures, the lowest being 3.3 and the highest 5.0.
The display underscores the importance of maintaining blood refrigerators as cold as possible. I believe you will find the paper is filled with useful information.