"Classic" in the sense of "before modern coloring," which started in the 90s. I figure the art was designed for old-school coloring, so they should use old-school coloring (remastered to eliminate the dots). The early Dark Horse Conan stuff was a good example of why modern coloring can be a bad idea...the Barry Smith art was completely overpowered by the colors. But the Simonson Thor coloring is good...very subtle in its use of modeling, giving the general sense of the original with a little extra kick.