I think you would have to paint the RI with the dust & alcohol after it drys.
Julia Usher may be able to help with this method. Search for "gold" in her blog search box.
You can probably mix in an edible gold luster like Roxy & Rich Hybrid Sparkle Dust [https://www.roxyandrich.com/food-coloring/hybrid-sparkle-dust], but it will never shine as much as painting it on.
You could use a polka dot stencil, a dauber, or a stylus: https://plaidonline.com/blog/july-2014/how-to-paint-polka-dots-professionally
I ordered mine from Edna de la Cruz's on-line store at Design Me A Cake. It is beautiful, but it is not edible.
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