Their cahier notebooks are actually my notebooks of choice for school notes (and notes of any kind, really) and I've never experienced feathering with them though have had some minor bleed through. I've used everything from needlepoint nibs like the Platinum UEF to broad LAMY nibs that laid down pools of inks. I guess maybe it depends all on the individual batches because I have had terrible experience with their sketchbooks. The paper has been awful in those that I've tried.
Forgot to add the inks I've used with them: Aurora Black (my favorite), Private Reserve Naples Blue, Akkerman Shocking Blue & Garuda Rood, MB Toffee Brown, Irish Green, Burgundy, Noodler's Dumas and a few others. All have behaved well in the cahiers but terribly in the sketchbooks.
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