I have just found a decades old, never used Parker fountain pen, with
the squeeze to fill type bladder system. Of course I don't have ink for
it, but I do have lots of black ink refill kits for inkjet printers, so
I tried that and it seems to work OK.

Any comments welcome please. Will the bladder dissolve the nib choke
up, or might it be OK long term?

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk