Amsterdam Turns Orange Ahead of Royal Ceremony The streets of Amsterdam are awash in the color orange in honor of the Netherlands' ruling House of Oranje-Nassau, as officials prepare for a once-in-a-generation rotation of royal titles - and the rest of the country gets ready to party. National broadcaster NOS reported that Crown Prince Willem-Alexander and his family were in the Royal Palace on the city's central Dam square Monday morning, rehearsing protocols for the ceremonies Tuesday. Queen Beatrix is to abdicate, Willem-Alexander become king, and his 9-year-old daughter Princess Catharina-Amalia become crown princess. In the historic city center, vendors are hawking orange clothes; shopkeepers are hanging up orange flags and rolling in countless kegs of beer; while city workers are busy cleaning the streets and canals and setting up bright orange temporary urinals.