Abstract: The invention relates to a nanostructured product with a structurally coloured surface. The nanostructured product includes a substrate with a nanostructured surface having nano-sized pillars or holes arranged in a periodic pattern and extending into or out from the substrate. The bottoms of the nano-sized holes or the tops of nano-sized pillars are provided with metal layers electrically isolated and distanced from a base surface of the nanostructured surface. A transparent or translucent protective layer covers the substrate and the metal layers.

Abstract: A machine tool comprising a machine head arranged to move between a number of positions, and to perform a machine operation on a workpiece; a cleaning nozzle for dispensing a fluid for cleaning at least one surface contaminated by swarf generated during said machine operation; a protective cover arranged to at least partially surround said workpiece and said machine head during operation. The cleaning nozzle is mounted to the machine head and arranged to direct a fluid towards at least an inner surface of said protective cover from a number of different positions of the machine head.