What colours are Roman shields

Usually, roman shields were red. A few roman shields were found at Dura Europus (Modern-day Syria). These shields were red in color, some were the traditional rectangular roman shield, others were large ovals. They were made mainly of poplar wood, with leather around the edges, and a dome of iron or bronze in the center. During the second century, the decoration of lightning bolts and eagle wings were the popular design on the shield, though this trend seemed to fizzle out in the 3rd century.