The NPR system is Vibrantz’s lead-free color range for the decoration of glass tumblers and tableware. NPR container glass enamels are also intermixable, which allows decorators to mix and match their own shades for optimal productivity with minimal inventory. It is recommended to perform preliminary tests before launching production with color mixtures from this system, especially for combinations of red or yellow cadmium-containing colors (as marked *) with any other colors.