Blue Jewelers Rouge For Polishing Non-Ferrous Metals & Plastic Synthetics. This a new bar of blue jewelers rouge. Used for cut and color on non-ferrous metals and plastic synthetics. Perfect for jewelers, crafters and studentsWe work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.