Then There Was "Peacock Blue" Ink
 

The nuns grudgingly tolerated ball-point pens, and only in
emergencies, preferred that we use fountain pens, and insisted on blue
or black ink. 1950s. There was a brand called "Skrip." After using
blue, black, blue-black, and royal blue, it was a real kick to learn
that Skrip made a flavor called "Peacock Blue" which was a gorgeous
turquoise. So the whole damn school started using it. It's a miracle
that the nuns tolerated it, because they liked to rain on your parade.
If something made you happy, they usually prohibited it. Little
pleasures and freedoms were few-and-far-between.

The most amazing thing about those days of fountain pens in elementary
school was that no one, as best I can recall, spilled a bottle of ink.
Otherwise there would've been an execution.

Then There Was "Peacock Blue" Ink