Titanium dioxide’s journey from the Earth’s crust to our lips is a long one. The food additive—which is used in foods like candy, cottage cheese, and frosting—starts as a metal found in a handful of minerals. It’s mined via earth blasting and drilling, and then processed into titanium dioxide. Once in the form of a fine, white powder, it can be added as a pigment to foods to make them look brighter and more opaque. The EU banned titanium dioxide in 2022 because there wasn’t enough evidence to prove it wasn’t toxic, but the US Food and Drug Administration allows it to be used in foods in quantities up to 1% of a product’s weight. Beyond its toxic uncertainty, the presence and use of titanium dioxide has far-reaching effects: Mining and processing the material is carbon-intensive, and creating it synthetically generates emissions, too. That’s why Mirra is working to replace titanium dioxide and petroleum-based food dyes using structural color, a physical process found in nature (think the vibrant colors of butterflies and birds). The team of scientists and innovators recently won the Massachusetts Clean Energy Center’s Climatetech Studio Showcase with technology they originated at Northeastern University. According to COO Elizabeth Bridges, Mirra will be able to better color foods than alternative food dyes, which tend to fade in the harsh conditions of food processing, like high temperatures, UV exposure, and changing pH levels. “We’re really focused on taking vegetables and foods and using them as food dyes,” Bridges said, “in a way that allows the food industry to continue the level of vibrant color and conditions that they’re using in their products today.” Keep reading here.—TC |