[@Mara] The way the cookie crumbles sometimes. But it was made red on purpose, errors in school papers or otherwise were often done in red for a reason. #Colorchoicesmatter :P (Just for possible interest.)

"A result that suggests, say the study’s authors, that the red pens make “the concept of errors and poor performance more cognitively accessible.” "The volunteers were told to mark any errors in punctuation, spelling, grammar and word choice. Those wielding the red pen marked significantly more errors than their blue-pen peers."

https://www.minnpost.com/second-opinion/2010/05/seeing-red-ink-color-used-correct-papers-may-bias-final-grade