When my first (and only) Nakaya, a Piccolo Roiro fitted with a soft/flexible M nib arrived middle of last year, I filled the pen with Platinum's own Blue-Black ink that I ordered along with the pen.
Now I like the colour of this ink - unfortunately, the Piccolo turned out to be a dry writer. As I write with the lightest of touch, a relatively heavy flow is must for me to write comfortably and smoothly. So I went to have its flow tuned, but after numerous attempts (even with the help of the local nib expert) this pen's flow is never to my satisfaction. All the while I thought it's the Nakaya's fault, while never even once considering the role the ink might play in it.
Getting frustrated, one day I decided to take the Nakaya apart. Now this pen's nib and feed (and other Platinum #3776's too) are not as easy to remove as the typical Bock ones. These components are very tightly fastened to the section, so considerable force need to be applied, and one needs to pull 'em out straight along its axis. This of course puts one at risk of damaging/misaligning the nib and breaking the feed, so dismantling the nib/feed as part of one's routine pen cleaning procedure (which I do as SOP with my Bock-nibbed ones) is not recommended with Nakaya/Platinum #3776 pens. Anyway I digress.... after pulling out the nib, I found that the Platinum ink had dried, hard, on the nib beneath the section on its surface facing the feed. So this explains the poor flow. Funny for Platinum's own ink to inflict this on its sister company's pen, and amazingly so as this pen has been in constant use (left unused at most, 2 days) since the day I received it. And even more so considering this pen's age
I then decided to fill it up with Quink Blue-Black (with Solv-X - this is a NOS bottle I found at a stationery shop) and I'm happy to say the Nakaya's flow has never been smoother - in fact it's great

. And its dark blue hue is beautiful too - it's slightly darker than Platinum's. Looks like it will be the ink of choice for my Nakaya Piccolo from now on
Shahrin