Beretta's ability to blend the finest classic features with the most modern production methods has led to the development of a process that allows color to be applied to steel on the finest Beretta over-and-under. Combining the elegant, lightly opaque yet transparent enamel with the steel is difficult because the steel, although extremely strong, is sensitive to the extreme temperatures required for applying the enamel. An innovative new process developed by a renowned Italian goldsmith for use in jewelry production, and patented by Beretta for use on firearms, allows the enamel to adhere perfectly to the incredibly durable steel used for the action of the prestigious Beretta SO6 EELL. This fusion is obtained at a low temperature (normally below 100^oCEELL. This fusion is obtained at a low temperature (normally below 100^oC. / 232^oF), thus does not modify the physical properties, durability or shape of the steel. The undulating arabesque engravings ("guilloche") add an elegant touch to the color without altering its transparency. In addition to the side plates, the hinge pins, top lever and grip cap of the shotgun feature colored highlights, and exquisite hand-made engraving enriches the non-colored metal. The S06 EESS can be ordered in Ruby, Sapphire or Emerald models.