For a fairly long period of time in the hobby, print freaks, miscuts and whatever else you want to call them, were generally shunned by collectors. There were exceptions, particularly those that crept into the old guides like the 1957 Topps Gene "Bakep" or their 1958 Pancho "Herrer" error, which were really just printing hiccups. These days a small but growing cadre of collectors is actively searching out such oddities and lobbying the grading companies to recognize more and more of them.
Some of these misfit cards hail from discards of full and partial scrap press sheets. When Topps had their main plant in Brooklyn, several dumpster divers would score such prizes and take them home for distribution to their kids, some of which were later introduced into the hobby recycling stream - shallow as it was back then - usually as singles that looked very much like they had been hacked by an eight year old (which they often were!). Topps scrap does pop up here and there (and will be looked at down the road) but when it comes to scarp sheets, Bowman is (was?) where it's at.
The black and white inaugural Bowman Baseball issue in 1948 was, well, kinda blah and Football followed in the same manner, but it was Basketball that brought color to their sports offerings in '48. Here's a look at a fully printed card of good ol' Speed" Spector:
Now take a look at the second card from the left in the third row to see Speed with a missing red color process. It results in a striking slate gray background: