I've been using Daler Rowney Acrylic Inks lately; Dr. Ph. Martin's Inks are also pretty good. With my gold(en) shades I add some of Dr. Martin's Pumpkin water color mixed with Daler Rowney Sepia or Burnt Umber & the metallic paint. An artist supply store would carry those things.
_________________ "I'd NEVER join a club that would have me as a member." Groucho Marx