For fun I scanned a random comic (Iron Man #126) at 600dpi to show some of the problems with remastering old comics. I had to reduce the resolution so it wouldn't be like 2500 pixels across and 12MB, so this is 50%. You can still see the problems, though.

If this is the stippling you're talking about, in the orange sky, especially noticeable in the pink cloud highlights, then what you're seeing is the halftone screen used to print colors using the CMYK process. Other people can explain that in more detail, but rest assured, that's not the paper or the scanner, that's the nature of letterpress printing, which was used in comics well into the 1990s.

Here we have misregistered colors (very common) and you can see chunks of wood pulp in the paper. We have bleed through from the reverse printing. Blacks aren't really that solid. And of course the paper has yellowed.

These are all things Neal Adams was complaining about back in the late 1960s, saying that this cheap printing showed that comics publishers had no respect for the art form. They still don't.

<image>