I posted this hint/question in another forum but had no responses ...
Anyway, I haven't tried that brand, but for those ink addicts here it may be of some interest.

This is a French (language) online store which is also one of the rare sailor importers in Europe.

www.insolite-worldwide.com

They offer 'Callifolio' ink, which is unknown to me. You can actually choose there the style of bottle they fill your ink in.

They have a regular line
http://www.insolite-worldwide.com/concept/...es_ecriture.php

and vegetal ink line + a real cochenille ink
http://www.insolite-worldwide.com/concept/...s_vegetales.php

Their ink bottles can also be purchased empty.