[Andrewausfa]

Mark,

There is a Japanese art pen manufacturer called Shachihata who did a range of 'paint' marker pens, you know the sort with a Xylene or Toluene or similiarly smelly carrier. In particular they did a very good Gold. The thing with this paint was they used a really very fine pigment very similiar to screening ink and if you decanted it from the pen by pressing down on the nib a few times, you could thin it and paint very fine detail with non of the metallic 'flakes' in you'd see in other paints. Unfortunately mine dried up years ago. Anyway, a long story to suggest that option might be worth a look.

Andrew