J. Herbin Fountain Pen Ink (30mL) - Bleu Myosotis

As Poussiere De Lune was out of stock when I visited the store, I opted for the Bleu Myositis instead. Practiced calligraphy using a dip pen with this ink the day before. The ink dried pretty quicky on Rhodia paper, given the amount of ink my 4mm Italian nib laid down. While the writing might appeared as a dull dark blue initially, some colour change could be observed a few days later.
So if one wanted instant gratification for purplish writing, one will need to look elsewhere. As for me, I would try this ink with a finer/dryer nib, which shall display the colour more favourably, with less ink laid down per stroke.

I have been writing with this ink since 2016, and I can tell you that this ink is a hidden gem. I agree that it initially dries into a "duller" blue shade (although it looks like a nice pastel blue to me), but with time, your writing will turn into a nice shade of lavender. Like its namesake, this ink is gentle and can take on any shade of the forget-me-not, given enough time

Can't argue with what the previous reviewer said. It's an ordinary blue -- nothing wrong with it, but it doesn't leap off the page either. Writes pretty wet coming from my Noodler's Konrad.

The colour doesn’t really look like its namesake flower – it’s noticeably darker. And when it dries, rather duller. Not that it’s bad, it’s just not very remarkable. It writes well enough and all and works as a decent standard blue. There’s nothing wrong with it, but it doesn’t stand out either.

It's a lovely lavender blue that's quite brilliant when writing, but dries to a dull shade, very poetic for its namesake if you think about it, like leaving an imprint of the colour it once bloomed.