iridescent blue with rainbow top, 10 1/2", signed, one tiny side mark flaw................Quezal’s wares are known for the use of bold iridescent colors, particularly blue, gold, purple, white and green. These can be compared to Tiffany's Favrile or Steuben's Aurene glass. And, in fact, Martin Bach, Sr. used the formulas he had learned while working with Tiffany to manufacture this glass, according to Shuman. Thomas Johnson, one of the company’s founders, was also a master glass craftsman who worked in Quezal factory alongside other skilled gaffers and glassblowers early on. He left in 1907 to work with Union Glass Company in Massachusetts contributing to the firm’s Kew Blas line.Designs were sometimes created by rolling, or marvering, hot glass to create a unique outer surface. Quezal was known for gold luster glass, agate glass, feather, and peacock eye designs, patterns with trailing leaves and flowers, and applied shell décor among others. "The enduring hallmark of Quezal art glass is its unique expression of the Art Nouveau style, based on organic shapes and naturalistic motifs coupled with technical perfection in the execution. .