My client wants this cake in buttercream and I have NO CLUE how to get a clean, sharp golden color in buttercream :S :(

Please help ASAP,

Thank you!

AI would say airbrush if. Here's a link for the color you can use, http://www.amazon.com/dp/B001T4OOOE/?tag=cakecentral-20

They are right. This is airbrush. If you don't have an airbrush set then try a canned spray like this one:

http://www.geeky-gadgets.com/ess-lack-edible-spray-paint-colors-your-food-yummy-28-10-2011/
 

But buy more than you need, reviews always make mention of clogged bottles that they had to return.

Oh Thank you sooooo much :D I will definitely get the air-spray device and the cans as well, love you two :)