There seems to be general agreement about the color scheme for the
Monitor: black above the waterline and anti-fouling red (probably a somewhat brighter red than we associate with hull bottoms nowadays) below. The idea of the
Viriginia being copper-sheathed certainly makes sense, in view of the fact that the original U.S.S.
Merrimack almost certainly was built that way.
I would be extremely leery of generalizations regarding the painting of Confederate ironclads - or Union ones either, for that matter. The documentation just isn't good enough. There are few photographs of them (nobody's yet found a photo of the
Virginia), and few if any pieces of documentation about color schemes.
Some of my students and I have been involved recently in a research project concerning the C.S.S.
Neuse, an ironclad ram whose remains are on exhibit at Kinston, NC, about 25 miles from where I live. A considerable amount of research about that vessel has been done by people who know what they're doing. Nobody has yet found any documentation whatever about the color scheme. We think she was coated with some sort of tarry substance below the waterline (that's the only part of the ship that's survived), but we have no idea what color she was above that. No photographs of her prior to her sinking in 1865 have been found. We do have one photo of the
Neuse's near-sister, the
Albemarle. She seems to be a fairly dark color of some sort - possibly black (sunlight in those old photos can be deceptive), but possibly a grey paint. Or maybe some other color. I also think it's entirely possible that the iron plating of the casemate wasn't painted at all. I suspect paint was a relatively low priority for those folks.
Part of the problem in studying these ships is that they don't follow the rules we normally take for granted, because they weren't built by shipbuilders. The
Neuse was built by carpenters and laborers (many of them presumably slaves, though we don't have detailed records) who happened to be available around the little town of White Hall, NC, which was chosen as a building site because it was located near a forest full of nice pine trees. The men worked from a set of very generalized plans supplied by the Confederate Navy Department, and used materials that were available and that looked like they would work. (The boiler, for instance, apparently came from a steam locomotive.) The surviving hull structure of the
Neuse is massive, incredibly solidly built, and decidedly un-ship-like. It's composed almost entirely of straight timbers, and timbers that were originally straight and got bent into place. There are no curved knees, deck beams, or other pieces of fancy nautical-style carpentry. On one level the thing is crude and ugly. On another it's a truly ingenious structure, making excellent use of available materials and skills to do a specific job. And I suspect the people responsible had little interest in color schemes.
I'd be interested to know what the curator of the museum in Columbus, Bob Holcomb, has to say about all this. I served on his MA thesis committee - longer ago than either he or I would care to admit. He's certainly one of the most knowledgeable people in the country regarding Confederate ironclads - and, by the way, an absolutely first-rate, courteous, and congenial gentleman. He and I chatted about the subject quite a bit when he was working on his master's degree, but that was a long time ago. If there's been some major discovery about ironclad color schemes since then, Bob undoubtedly knows about it. But I suspect he'll be the first to acknowledge that any reconstruction of such a ship involves a great deal of guesswork - especially when it comes to color schemes.