At the Koon Chun Sauce Factory workers are scrambling to cover hundreds of thousands of bottles with new "Made in China" labels as the popular Hong Kong brand falls victim to spiralling diplomatic tensions. Founded nearly a century ago, the family owned factory has been churning out culinary staples such as soy, hoisin and oyster sauces found in Chinese restaurants and kitchens around the world. But from November it can no longer place the words "Made in Hong Kong" on any products exported to the United States.