“Pens.” Pens, by definition, come equipped with ink. Otherwise, they’d be “pencils.”
“Ink Pens” is redundant, and it surprises me to hear a teacher call them that. But I am quibbling, so don’t take me seriously.
Remember when you had to specify “ballpoint” pen to distinguish it from a fountain pen?
Yeah, I’m just barely that old.
I use ink pens as opposed to felt tipped pens. Sharpies would be an example of this. They bleed through papers and onto desks, making paper grading impossible and classroom cleaning a pain. The packages of most of the non-felt tipped pens are labeled “ink pen”, so I’m only going by what the manufacturer brands them as.
No he said "blue or black ink pens"... he's being precise not redundant. If someone said, "Please hand me that blue pen," do I give him the pen with blue ink or do I give him the pen made out of blue plastic?
But I'm being pedantic (and also leading with a conjunction) so don't take me seriously, either. [big grin with a wink]