Argus News - NIT Rourkela Patents Green Technology For Black Terracotta Craft

Rourkela, Nov 17: In a breakthrough that bridges tradition with sustainability, researchers at the National Institute of Technology Rourkela (NIT Rourkela) have patented an eco-friendly process to produce black terracotta wares, officials said on Saturday.

The innovation drastically reduces the firing time from two days to less than seven hours, while eliminating harmful emissions that affect workers and the environment.

Reviving Ancient Craft

Terracotta, meaning “baked earth” in Italian, has been a cornerstone of Indian heritage, widely used in utensils, temple sculptures, and roofing tiles. While red terracotta is common, black terracotta is prized for its mirror-like finish and cultural significance. Traditional black pottery methods, such as those practiced in Nizamabad (Uttar Pradesh) and Tibet’s Nixi village, rely on open-pit firing with organic fuels, often producing toxic smoke and requiring skilled artisans.

The Innovation

The patented process (Patent No. 572754, Application No. 202531008090), developed by Prof. Swadesh Kumar Pratihar, Mr. Shiv Kumar Verma, and Dr. Rupesh Mandal, introduces indirect heating in an enclosed vacuum chamber. Pyrolysis of carbonaceous oil generates carbon monoxide and soot, creating the reducing atmosphere necessary for black coloration. This eliminates the need for open fires, specialized clay, or constant manual monitoring.

Also Read: NIT Rourkela Patents AI Model to Boost Road Safety

Sustainable Impact

Prof. Pratihar explained, “The sustainable production process merges traditional artisan knowledge with modern technology. The key is indirect heating in a vacuum chamber, which ensures uniform black finish without environmental pollution.”

The method not only shortens the firing cycle but also safeguards workers’ health by avoiding exposure to toxic gases. It represents a scalable solution for producing black terracotta anywhere, making it a significant step toward environmental conservation and heritage preservation.

Towards Heritage Preservation

By combining modern ceramic engineering with traditional artistry, NIT Rourkela’s innovation ensures that India’s black terracotta craft can thrive sustainably. This development strengthens India’s position in conserving cultural heritage while embracing green technology for the future.