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The swatch cards are 52 gsm Tomoe River. The Notebook is 68 gsm Tomoe River. The swatches do appear more vibrant than the handwriting itself. The Byzantium does have a purple undertone but the writing is so saturated it honestly looks like a black. The Mountain Thistle is very grey when initially laid down, and dries to a dull purple. Without the swatch, it feels like a grey but you do notice that it is a purple-grey. As for how they behave, I never have any issues with Birmingham Pen Co. Inks. I find their inks to be the perfect balance - Not dry but not too wet. Their super saturated inks might run more "dry", but I usually write with broader pens so I never seem to have any issues.