Gold is a shade of the color "yellow" closest to that of gold metal.
Of course the visual sensation usually associated with the metal gold is its metallic shine. This cannot be reproduced by a simple solid color, because the shiny effect is due to the material's brightness varying with the surface's angle to the light source.
This is why in art one would usually use a metallic paint that at least glitters like real gold, as a solid color like that of the box on this page would not be considered gold. Especially in sacral art in Christian churches, real sheet gold was used for rendering gold in paintings, e. g. for the halo of saints.
But also more recent art styles, e.g. Art Nouveau liked to use metallic, shining gold color. However, the metallic finish of these paints is added using fine aluminium powder and pigment rather than actual gold.
See also
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