KWZ Gummiberry Ink. This ink color comes in both iron gall and regular versions. The iron gall version is a dark purple with very good water-resistance. The regular Gummiberry discussed here is a dye-based ink in a lighter, cheerful purple.
(click Page 2 below to continue)
Pages: 1 2
Fountain Pen Follies 
I think there wasn’t really one ink – as far as I know ink was shipped to the schools in powder or tablet form and mixed on-site. That was way back in the day, and it was just a medium purple AFAIK, so both would fit the bill. In my time it was offered more as a ‘legacy’ option, I guess, because by then the default was Erasablue. I tried to find some decent sources on purple ink to link to here but there isn’t a whole lot, and most of it is more like personal reminiscing – neat, but no wider context 🙂
LikeLiked by 1 person
Neat. I had always thought that J. Herbin Violette Pensée was one of the French school inks, and that’s another purple ink I like.
LikeLike
This reminds me a lot of the classic French school ink which is “violette” – a purple where the blue and red are balanced. The resemblance is strongest with the Kaweco Sport on the Rhodia paper.
LikeLiked by 1 person