I have a jar of honey that has a load of gold flakes suspended in it. It has been sat still for 24 hours and the flakes have risen to the surface. At least the bigger parts and the small ones stayed as they were. Any ideas as to the physics behind this and also if its possible to prevent the bigger ones from rising to the surface?
Gold is denser than honey. It should sink. You can see here that it does.
On the other hand, you can see here that it floats.
The difficulty is that gold foil is very thin, $0.001$ inch or less. When added to honey, an air bubble often is attached. Air floats.
The same problem applies to Murano glass. This is art glass with gold flakes in it. The problem isn't that the flakes will float. But bubbles don't look good. The manufacturer has figured out how to avoid bubbles.
It look like one brand of honey has figured it out and the other hasn't.