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The Twsbi fountain pen ink refill is available in black and comes in a sandblasted glass bottle. The special plastic insert inside lets you draw up the last drop of ink. The bottle’s neck fits the cap of the Diamond 50.
The ink is suitable for all fountain pens and flows exceptionally well on paper, with a satisfactory drying time. It is not permanent and is not waterproof.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.