How in the world do you make the color "gold" for frosting???? ........................................... I'm going to hate myself if its to easy
Americolor makes gold color but it is basically a flat yellowish color to achieve actual gold you must purchase luster dust to which you add a clear alcohol such as vodka then you paint the detail in question. This is obviously not an option with buttercream but look good on fondant, gum paste & dry royal icing. I personally add the gold food color to what I plan to paint gold the base color make the luster dust look more like actual gold.
Edible lustre spray works well on fondant dont know about buttercream never tried it on that.
I do gold on whipped cream (Pastry Pride) so it should work on buttercream. Color it yellow, then airbrush Gold shimmer onto it. It will be GOLD!
It isn't as pretty as painting royal icing or fondant with luster dust put I have put a jar of ultra gold in some piping gel and used that to pipe with. It worked enough to get the effect. Another solution may be to chill your piped cake, if your buttercream is butter you should be able to paint it with a brush until the icing isn't chilled and put it bake in the cooler. Good luck!