The 754 series of interference colors is a lead-free range of container glass enamels formulated for the decoration of opal glass dinnerware and is also suitable for some types of glass tumblers. These glass enamels provide a palette of 11 color shades that achieve an intense, bright and glossy tone when applied on dark glazes such as cobalt blue or black, specifically formulated for opal glass dinnerware and is also suitable for a selection glass tumblers. It is not recommended for or the decoration of pressurized containers. On light backgrounds, interference colors give the impression of a transparent coating that shimmers green, blue, red, or golden when viewed at a certain angle.