Ultramarine is part of the Keystone Formula fountain pen ink line, our traditional dye-colorant ink. This hue will produce a sheening effect when saturated on high-quality papers like Tomoe River and Midori MD. Our writing sample in this listing was made on 68 gsm Tomoe River paper. Color will pull toward a strong medium blue with more so
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This ink is my new favorite. I love the quality of it, and the color is beautiful on any paper.