Curse of Frankenstein looks terrible on BD. It's taken from an old composite of sep. elements. Unfortunately, no Technicolor IB prints exist as reference to show the original color.
Still, it could use some fixing. It's really soft, as-is, too; I'm not sure how that part can be fixed. Could someone who knows more about physical film enlighten me if sep. elements form a low-contrast element? It looks like the contrast could be deepened for a more "correct" image. Deeper contrast might make the color look better too.
Hammer's Dracula has flaws, but it really isn't as bad as some people say it is. It's certainly more accurate than the DVD, which is ridiculously under-contrasted and dull. It, in fact, looks quite similar to The Curse of Frankenstein, so that makes me think Curse could be corrected... I doubt the theatrical version looked like any of the releases.
Many films really need color-timing correction.