Unsupported browser

You are using an outdated browser. Please upgrade your browser to improve your experience.

Sign up for an Award

Participate with your entry in one of our professional or student awards.

Sign up for an award

Sign up for a Profile

Create your own profile and publish it in the iF WORLD DESIGN GUIDE.

Sign up for a profile

Learn more:


Present your project for free and win your share of EUR 50,000 in prize money.

Publish your project

Egg Tag / Freshness Indicator

Egg Tag

How to tell an egg is fresh or not is a tough question in daily life. Although there are some small tricks, for example, submerge the egg into the water or simply check the production date to refer to the freshness, they are not convenient at all. Inspired by chemical indicator, the pH of solutions can be expressed in different color scale, what if the freshness of the egg can be expressed in different colors as well? Since during the oxidation of egg, it will constantly release carbon dioxide and its amount can be set as the variable to determine the freshness of the egg.


University College London

University College London
London, United Kingdom

University of Nottingham Ningbo