btw, wanted to mention an issue with Platinum Blue-black in cartridges.
This ink was used exclusively in a NOS vintage Platinum short pen for several years--but only infrequently (when travelling). The pen was always rinsed out when not in use (tap water), but not the cap. Over time (and probably less than 10 cartridges) the gold plating has begun flaking away on the gold-band/clutch at the end of the section--with some pitting and corrosion underneath.
There are some (Daniel K) that warn us to avoid all pens with gold-plated rings at the end of the section, as many inks will corrode it eventually.
However, just wanted to dispel the oft-repeated myth that pen manufacturers' ink is always safe, especially in their own pens.
The IG content of the Platinum ink, which is the only ink that was ever used in this pen, definitely took a toll on the section trim. And now i'll be trying other inks.
The new Parker Blue-Black is much more saturated than the old, washed out classic Blue-black. It's not Iron-gall though, so it may be my new ink for this pen.
Edited by stephenchin, 23 June 2020 - 02:33.