Aldi and Arla Foods UK have launched an eight-week trial using ultraviolet tags to track milk bottles through the recycling system. The pilot, conducted in partnership with recycling technology provider Polytag, aims to give the companies a clearer picture of how dairy packaging moves through the waste and recycling chain. Invisible UV tags will be printed onto wrap-around labels applied to Arla’s milk bottles at its Oakthorpe dairy. Aldi and Arla will be able to access the information through Polytag’s online dashboard, providing insight into the bottles’ recycling rates and journey. The project builds on an initial trial conducted by Aldi, Arla and Polytag in 2023, which used pressure-sensitive labels.