I did a search on this & only found a 2004 post about what to paint with.
http://forum.cakecentral.com/cake-decorating-ftopict-93801-gold.html+painted+chocolate

So here was my experiment.

My friend wanted a 1st communion cake with a Gold Chalice for her son. (see my pictures.)

I figured the easiest way to do this was to make the chalice out of choc. & paint it with Gold Luster dust diluted in a bit of Grand-Marnier (I prefer this stuff it smells nice)

Anyhow there is a definite color difference & everyone seems to choose the white chocolate on the right.

Hope this can help someone. Good Day!

Wow, that is a BIG difference. Thanks for sharing!

The dark chocolate makes it aged looking but almost a brassy color as well.
Thanks for sharing!