A colleague showed me his Twsbi Eco and I was so impressed by the piston-filler concept, it re-kindled my love of fountain pens after a 4-year hiatus. Now I need a nice blue ink to go with it . I've been using Parker Quink permanent blue for most of my life and I love it. My other favourite ink is Waterman Florida blue (last bottle I purchased was in 2009 so I still use the old name in my head ). Looking for an ink that's slightly less "purple" and more "blue" than these, with the following qualities: Quick-drying (I'm left-handed) Wet/smooth feel of nib on paper (I currently use a Lamy EF nib) Saturated/strong colour. I don't like dilute inks that show shading (I dislike Quink washable blue and Pelikan 4001 Blue for this reason) Won't stain the polycarbonate barrel of the Twisbi (hence my hesitation to try anything by Noodler's) Won't fade over time (Quink washable blue was notorious for this, school notes would be grey by the time I needed to study from them a year later)Regarding the shade of blue, - something that's more light/blue than the Quink/Waterman, but far from torquise (I use it for work so it has to look "serious"). No darker colours - I'm not a fan of "murky" hues like Quink blue-black, much prefer pure blue or pure black.