Oh boy, this brought back memories. Turquoise Blue + Chelpark was nirvana level experience for me. Whoever (mostly teachers) noticed that shade of blue would get immediately confused. Is it blue? Is it Green? It would lead to a good discussion!
I have fond memories of using ink pens. When any kid in our broader family reached tenth grade, my grandfather would gift them a Parker ink pen. And the last day of exams was the customary throwing ink on each other.
We had an English teacher who used to chide us for writing with anything other than a pencil till the 5th standard, and after that, would insist that we write with ONLY fountain pens.
Chelpark Turquoise and Bril Royal blue were my favorites too. They both looked brilliant on paper!