Well adding a bit of black to a yellow kinda makes a pooh colored gold and not the metallic gold...I don't think any color will give you that.
The only way that I know to know to have the gold metallic color is to first ice the cake w/ buttercream and use a gold luster dust which is a powder you paint on the cake w/ wilton clear vanilla or vodka..start by dipping a sm amt of luster dust w a sm amt of liquid to paint kinda like a paste let it dry. another tip is to use a camel hair brush because it sheds less. I did a 50th w the stuff it is great as long as it is not the Wilton one.
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