YAY! CANDY!

WARNINGS:
CHOKING HAZARD: SMALL PARTS. DO NOT INGEST. PRODUCT IS NOT FOOD. DO NOT HANDLE CRYSTALS. IF SWALLOWED, DO NOT INDUCE VOMITING. SEEK MEDICAL ADVICE IMMEDIATELY. CONTACT WITH PRODUCT MAY CAUSE SKIN IRRITATION. IF EYE CONTACT OCCURS, FLUSH EYES THOROUGHLY WITH WATER FOR 15 MINUTES. IF SKIN CONTACT OCCURS, WASH AREA WITH SOAP AND WATER. USE WITH CARE AROUND BIRDS AND OTHER SENSITIVE HOUSEHOLD PETS. KEEP OUT OF REACH OF CHILDREN AND PETS.

This probably already exists...

How about a sticker that goes on refrigerated and frozen foods while still at the factory - as long as the temperature stays in the permitted range, the sticker stays a friendly color.

Perhaps even a yummy smiley-face could be on the sticker, along with the message "I Was Always Frozen!".

If the temperature rises above the permitted range, the sticker would change - and never change back to the original yummy state. Mebbe Mr. Yuk could be hired for the job?

"I Thawed Out and Then Spoiled"

Then you would know if the boxes sat in an unrefrigerated truck overnight, or stacked on the floor at the grocery store too long before being put away - or even left on your counter too long.

This seems like a very logical and totally do-able thing - It's probably already in use somewhere, but I've never seen it.