Coal armor
Coal Armor refers to armor created from Coal, which is quite rare and thus generally considered valuable.
Coal was one of the gift items included in the 1997 "Naughty" Christmas Bag during Holiday 1997 holiday season. These particular bags were awarded to negative-Karma players. Coal ingots were created by smelting the coal and some players were able to collect enough of these ingots to create sets of armor. GM marked armor made from coal ingots can be quite valuable.
Coal ingots are a slightly different shade of color than Shadow ingots.