A closed loop for plastic products and packaging is possible with bio-based, biodegradable polymers. For this cycle, all materials have to meet very high expectations, also with regard to colouring. As part of its "eternity colours" concept, Lifocolor has developed Bio-C masterbatches based on 100% natural, vegan colourants. They can be processed in the extrusion and injection moulding process at temperatures of up to 240 °C and are ideally suited for bio-based, biodegradable PLAs, PLA blends, PHAs and PHA blends. However, they can in principle also be developed for other biopolymers.