Did you notice?
The subtitle appearing at the bottom of the cover to TMNT Vol. I #48 is “Shades of Grey Part One of Two” (June, 1992). The subtitle appearing at the bottom of the cover to TMNT Vol. I #49 is “Shades of Gray Part Two of Two” (July, 1992). Similar yet different. Pretty interesting.
The official TMNT website (http://www.ninjaturtles.com/) lists both issues as “Shades of Gray.” When you see these two issues in a guide or a list you’ll find that when #48 is listed as “Shades of Gray” then #49 is also listed as the same (and vice versa).
Officially, either spelling is acceptable although I’ve always been partial to “grey” myself.
What do you think? Was this done on purpose or was it an oversight?