Which panels hold what temperature?

The Cool Cube panels are identified by both the label and tab colors: Blue: For Refrigerator Temperatures PCM, used in the VT and BT product lines. Gray: For Lab Freezer PCM, used in the FT line of Cool Cubes. Tan: For Room Temperature PCM, used in the RT line of Cool Cubes.

When are panels ready for use? 

To prevent the cooler from warming (in hot conditions), panels should be solid. To prevent the cooler from cooling (in cold conditions), panels should be liquid.