US-based thermochromic inks producer Chromatic Technologies (CTI) has unveiled package indicators that allow consumers to protect themselves from food poisoning.
The indicators, called 'reveal inks', turn on when the temperature of the food packaging is getting warm.
Consumers can use this information to prevent vulnerable food items such as milk, yoghurt and mayonnaise from spoiling.
CTI chief marketing officer Patrick Edson said that food manufacturing firms are sceptical about putting warning labels on their packaging, which paves the way for food poisoning.
"Most parents know that food safety at home is a big deal, but they need help understanding how long they can keep something out of the fridge," Edson added.
The indicators are made from thermochromic ink which display a positive message on cartons at a safe temperature. When cartons reach a temperature of 40° F, this colour disappears and a 'return to fridge' message is revealed to consumers.
The US Department of Agriculture's Food Safety and Inspection Service recommends that refrigerated food should not be consumed if it has been kept in temperatures above 40° F for more than two hours.
Image: CTI's new 'reveal inks' provide consumers with 'return to fridge' message that is found on packages of food items including milk, yogurt, salsa, pickles and ketchup. Photo: courtesy of CTI.