A comparison of ten medium blue fountain pen inks (Blackstone Barrier Reef Blue, De Atramentis Steel Blue, Noodler’s Navy, Levenger Empyrean, Noodler’s Ottoman Azure, Pelikan Edelstein Topaz, Pilot Iroshizuku Kon-Peki, Robert Oster Blue Sea, Robert Oster School Blue, Toucan Bright Blue). This image shows the water test in progress.
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