Picked up "Dungeons & Dragons and Philosophy" a month or so ago. In the chapter titled "Elf Stereotypes" it discusses the subraces from Forgotten realms. Some of it pops up if you enter: philosophy of d&d racism in google books . In particular pages 95-99 lay out the following in much more details...
wood [=copper] elves - coppery skin with brown or black hair living in harmony with their environment
"In a way, that just makes sense: of course if you're going to have a fantasy race that longs to be one with nature, you are going to create a people that reminds you of the human race that most longs to be one with nature. It isn't like there's a stereotypically Asian set of elves..."
sun [=gold] elves - high intelligence, hierarchical society, prestige of family names, martial arts
moon [=silver] elves - the default, generally good traits
dark elves - the good drow, brown skin not black
drow - black skin, the bad ones, strong women, often die young due to violence, live separated from all the good elves
Regardless of its connection to how the subraces were actually designed... ouch.