Jop Euwijk and Frank Rensen in an article in Historiek provide some of the earliest examples of how Black Pit characters began to be seen as reflecting racism.
The first example is the incident in 1927. A black man on trial in Rotterdam defended himself that he beat a dockworker for verbal abuse. He also said black people in the Netherlands were constantly called "Black Pit".Another incident occurred in 1939. At that time a black teacher was reprimanded by a student's parents when they were riding the same tram in the Sittard area. The reason was trivial: his son cried after seeing the Black Pit there.