Colorizing Brass Stampings with Swellegant Metal Coatings It has been several years since Christi Friesen released a line of metal coatings and colorants called Swellegant. Christi primarily uses the metal coatings to transform, patina, and dye polymer clay, but I played with it on the Nunn Design Brass Stampings! I love the effect! To learn more on how I created this Swellegant Sampler, visit the Nunn Design Blog to read more.