COFFIRE introduces an innovative porcelain surface finishing technique that uses spent coffee grounds as a sustainable colouring material, mimicking the textures of marble in a mass production setting.

Inspired by the ancient Chinese pit firing technique, this eco-conscious staining method takes place during a low-temperature firing process (600-800°C). At these temperatures, the biodiesel and sugars in the coffee grounds oxidise into a red pigment, which interacts with the ceramic surface to create organic, random textures. The final appearance is influenced by multiple factors, including temperature, humidity, and the density of the coffee grounds.

The COFFIRE project embraces an ‘imperfect’ design language, exploring the relationship between industrial standardised production and craftsmanship. Unlike traditional pit firing, which often relies on toxic metal-based colourants, this technique ensures product safety by using natural and sustainable materials. Additionally, COFFIRE replaces the traditional sand pit with a gas kiln, making mass production feasible while significantly reducing waste, a common issue in conventional pit firing methods.

This pioneering approach not only enhances aesthetic value but also contributes to a more sustainable future in ceramic production.