TimeHue

ZeroTech Color-Changing Timer for Food Preservation

Timeline: May 2024 to May 2024
Role: Group Concept Project
My Contribution: 3D Prototyping, User Testing, User Research
TimeHue is a product featuring an adjustable plug and lid, designed to improve food preservation through a zero-tech approach. It includes a color-changing timer that tracks food freshness based on humidity levels, requiring no power. The reusable silicone plugs fit into food preservation lids, and the color can be restored by reheating in the microwave. This sustainable system offers an easy way to monitor food spoilage, ensuring freshness while reducing waste.
This project was inspired by insights gathered from our research process. We discovered that users, especially the elderly, prefer low-tech tools in the kitchen. Many of them struggle to detect when food has spoiled. TimeHue provides a practical, user-friendly way to prevent waste and keep track of food expiration with minimal maintenance.
[ CHALLENGES ]
The main challenge in this project was finding a zero-tech solution for detecting food spoilage. We wanted to create a simple, user-friendly tool that didn’t rely on complex technology, making it accessible for all, especially the elderly. Traditional methods of tracking food freshness can be unreliable or difficult to manage, particularly for users who prefer low-tech solutions.
[ SOLUTION ]
Our answer to this challenge was TimeHue, a silicone-based, color-changing timer that reacts to moisture levels inside food containers. By offering a clear, visual cue that changes over time, TimeHue allows users to easily monitor the freshness of their food without needing any digital devices or complicated systems.
The user is inserting a toast-shaped silicone plug into the lid of the container. (Left Image)TimeHue changes color as it absorbs moisture inside the fridge (Right Image)

TimeHue is a product that manages food spoilage using a silicone plug and lid system, designed for four food categories: eggs, meats, vegetables (fruits), and bread (toast). As food is stored, the silicone beads inside the plug changes color, transitioning from orange to green, signaling when the food should be consumed for freshness.

TimeHue in the Microwave

The silicone beads inside the plug absorb moisture from the fridge, and when reheated in the microwave, they dry out and return to their original orange color, making TimeHue reusable and efficient for continuous food freshness tracking.

From left to right: Meet Pedro, an 80-year-old widower living in his one-bedroom home, drew our concept on the whiteboard, tested how long it takes for the silicone beads to change color over time, and completed the silicone molding process

In the design process, we embraced zero-tech for its simplicity and practicality in kitchen settings. We selected food-grade silicone for its durability, heat resistance, and flexibility, allowing it to fit various container sizes. The color-changing silica beads, commonly used in packaging to absorb moisture, are embedded in the lid and act as a visual freshness indicator. This design provides an intuitive, effective solution for food storage without relying on high-tech systems.

silicone plugs come in various shapes, with different densities of holes

Silicone plugs in various shapes, each filled with color-changing silica beads, shift from yellow to green as they absorb moisture. The density of holes in the silicone plugs varies depending on the type of food they are designed for, from lowest to highest: baked goods, fruits, leftover meals, and prepared proteins. This variation helps control the rate of exposure to moisture, allowing each plug to track food spoilage rates effectively for different food types.

silicone plugs in various shapes

This project opened a new design approach for me, where materials themselves become a key solution instead of relying solely on high-tech innovations. Over time, I realized that simple, effective materials, like silicone, can offer innovative, low-tech solutions for real-world challenges. This shift in thinking allowed me to explore how sustainable, functional design can be achieved with minimal technology while still addressing modern needs efficiently.