Well, I may have found my own answer. The DuPont Refinish Historical Color Chip Library shows a Dark Aqua 181-97788 (511) (536). It looks almost black, but of course I'm partially colorblind, seriously. Is this correct, and does it look like black to you? Thanks.
DuPont's Color Library : Start with
www.performancecoatings.dupont.com , then click Visitor at the top, Then Color on the top menu, followed by "Color Chip Library - Historical" & then "DuPont Refinish" on the left side. Lastly, click "Launch the DuPont Refinish Historical Color Chip Library" at the bottom of the page. Then you can Browse at the bottom of the page.
Sorry for the long procedure, but I wanted this to be duplicatable.