This cannot be reproduced by a simple solid color because the shiny effect is due to the material's brightness varying with the surface angle to the light source.
In addition, there is no mechanism for showing metallic or fluorescent colors on a computer without resorting to rendering software that simulates the action of light on a shiny surface.
Consequently, in art and in heraldry, one would typically use a metallic paint that glitters like real silver.
Crayola's silver is not a neutral grayscale color but a warm gray with a very slight tinge of orange-red.
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