In order to assess the color of engravings made with engraving equipment, Signvec offers a variety of engraving materials in terms of colors , thickness, and finish. While there are several techniques for coloring with engraving tools, paint stick, paint fill, and oxidation are the three most used methods.The engraving medium comes in a variety of types and hues. There are a multitude of hues to choose from, including black, white, red, blue, green, yellow, orange, purple, pink, brown, and gray.