Metallic silver or gray is a shade that resembles gray and is a representation of the color of shiny silver. The visual sensation generally associated with metallic silver is its metallic sheen. This cannot be reproduced with a simple solid color because the gloss effect is caused by the sheen of the material changing with the angle of the surface to the light source. Also, there is no mechanism to display metallic or fluorescent colors on a computer without using rendering software that simulates the effect of light on a glossy surface. Therefore, in art and heraldry, metallic colors that shine like real silver are normally used. A dull gray color could also be used to represent silver.