Just a report back from my visit to the art shop:
They do have a lot of Rohrer & Klingner stuff indeed, many different colours of inks

, which somehow didnŽt seem familar

. I then realized they were all permanent, pigmented inks, for use with paint brushes and for calligraphy with dip pens only...
I asked whether they did any of the fp inks, and they said they didnŽt. They were prepared to order, but there was a minimum quantity per bottle, which could well be 6 or 10, and I would have to take all.
Oh well, IŽll have to try a different method, then

.
Warm regards, Wim