Abstract: An indicating device for evidencing thawing temperatures in a food storage compartment of a freezer having a container having an upper transparent portion and a lower opaque portion provided with inward projections. Colored water can be frozen in place within the opaque portion of the container and the container then set on it side in the freezer compartment. The projections hold the ice in place in the opaque portion of the container so that the extent of thawing is evidenced by the presence of water in the transparent portion of the container in the event of a rise in temperature in the freezer compartment.

Abstract: A freeze-thaw indicator for evidencing thawing of frozen foods in freezer compartments which has a float disposed in the container containing an aqueous solution of urea. The float is frozen in place in an immersed condition in the urea and rises only when the aqueous solution has been subjected to thawing temperatures over a time sufficient to completely liquify the aqueous solution. The strength of the aqueous solution is adjusted so that it will not liquify during the freeze thaws cycles of frost-free-type of refrigerators.